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these changes do not constitute any alteration to the contents of the document itself.

Renesas Technology Home Page: http://www.renesas.com

Renesas Technology Corp.

Customer Support Dept.

April 1, 2003

To all our customers

Cautions

Keep safety first in your circuit designs!

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contained therein.

HA16129AFPJ

Single Watchdog Timer

ADE-204-067 (Z)

Rev. 0

Mar. 2001

Description

The HA16129AFPJ is a watchdog timer IC that monitors a microprocessor for runaway. In addition to the
watchdog timer function, the HA16129AFPJ also provides a function for supplying a high-precision
stabilized power supply to the microprocessor, a power on reset function, a power supply voltage
monitoring function, and a fail-safe function that masks the microprocessor outputs if a runaway is
detected.

Functions

Watchdog timer (WDT) function
Monitors the P-RUN signal output by the microprocessor, and issues an auto-reset (

RES) signal if a

microprocessor runaway is detected.

Stabilized power supply
Provides power to the microprocessor.

Power on and clock off functions
The power on function outputs a low level signal to the microprocessor for a fixed period when power
is first applied.

The clock off function outputs a

RES signal to the microprocessor a fixed period after a runaway

occurs.

Power supply monitoring function
When the reference voltage (Vout) falls and becomes lower than the

NMI detection voltage (4.63 V,

Typ) or the

STBY detection voltage (3.0 V Typ), this function outputs either an NMI signal or an STBY

signal, respectively. Note that NMI detection can be set to monitor either V

or Vout.

OUTE function

(fail-safe function)

Outputs a signal used to mask microprocessor outputs when a microprocessor runaway has been
detected.

RES delay function
Sets the delay between the time the

NMI signal is output and the time the RES signal is output.

Protection functions
The HA16129AFPJ incorporates both Vout overvoltage prevention and short detection functions.

Note: 1. OUTE function: OUTE is an abbreviation for output enable.

HA16129AFPJ

Block Diagram

71k

1.5V

STBY

detection

block

36.8k

NMI

detection

block

25k

1.18V

70k

80k

3.3k

STBYadj

NMIsns

NMIadj

To Vout

31.2k

RES

STBY

detection

block

NMI

If*16

If/6

P-RUN

WDT block

*4/3

Delay circuit block

8.4k

20k

33k

19k

3.3k

RES

OUTE
block

3.3k

OUTE

NMI

STBY

Regulator block

CONT

Short
detection
block

Voadj

OUT

To microprocessor
(or other device)
power supply
connections

RES

block

GND

3.3k

1.24V

Overvoltage
detection
block

Note: The current, voltage, and resistor values listed in the diagram are reference values.

: Connect to Vout

HA16129AFPJ

Pin Function

Related
Function

Pin
No.

Symbol

Function

WDT.

P-RUN

Watchdog timer pulse input. The auto-reset function is controlled by the

duty cycle or frequency of this input pulse signal.

The resistor connected to this pin determines the current that flows in the
Cf pin capacitor. Use the resistor value from 100 k

to 500 k

The current determined by the Rf pin charges the Cf capacitor and the
potential on this pin determines the watchdog timer frequency band.

, t

OFF

The resistor connected to this pin determines the current that flows in the
C

pin capacitor. Use the resistor value from 100 k

to 500 k

The current determined by the R

pin charges the capacitor C

and the

potential on this pin controls the

RES

function (toff, t

, and t

The resistor R

, which determines only the time t

for the

RES

function is

connected to this pin. This resistor determines the current that charges the
capacitor C

for the time t

. Use the resistor value from 100 k

to 500 k

tr, t

RES

The current determined by the Rf pin charges the capacitor C

RES

, and the

RES

delay times (Tr and T

RES

) are determined by the potential of this

capacitor.

GND

Ground

Vout

Voadj

Insert the resistor Roadj if fine adjustment of the regulator output voltage
Vout is required. Leave this pin open if Vout does not need to be changed.

Output

OUTE

Output for the OUTE function

Power
supply

Power supply

Short
detection

Connect the overcurrent detection resistor between the CS pin and the V

pin. If this function is not used, short this pin to V

. Also, connect this pin

to the emitter of the external transistor.

Vout

CONT

Connect this pin to the base of the external transistor.

OUT

Provides the regulator output voltage and the IC internal power supply.
Connect this pin to the collector of the external transistor.

NMI

NMIsns

This pin senses the

NMI

detection voltage. If V

is to be detected,

connect this pin to the V

pin (however, note that an external resistor is

required), and if Vout is to be detected, connect this pin to the V

OUT

pin.

NMIadj

Insert a resistor if fine adjustment of the

NMI

detection voltage is required.

Leave this pin open if fine adjustment is not required.

Output

NMI

output

Output

RES

output

STBY

STBYadj

Insert a resistor if fine adjustment of the

S T B Y

detection voltage is

required. Leave this pin open if fine adjustment is not required.

Output

STBY

output

HA16129AFPJ

Functional Description

This section describes the functions provided by the HA16129FPJ. See the section on formulas for details
on adjustment methods.

Regulator Block

Vout Voltage
This IC provides a stabilized 5 V power supply by controlling the base current of an external transistor. The
largest current (the maximum CONT pin current) that can be drawn by the base of this external transistor is
20 mA. Also note that the Vout output is also used for the power supply for this IC's internal circuits.

Short Detection Block

When a current detection resistor (R

) is connected between the V

pin and the CS pin, and the voltage

between these pins exceeds the V

voltage (700 mV Typ), the CONT pin function turns off and the output

voltage supply is stopped.

Output Voltage (Vout) Adjustment

The output voltage can be adjusted by connecting an external resistor at the output voltage adjustment pin
(Voadj). However, if for some reason the voltage on this Vout line increases and exceeds the voltage
adjustment range (7 V Max), the CONT pin function turns off and the output voltage supply is stopped.

Refer to the timing charts in conjunction with the following items.

LVI (Low Voltage Inhibit)

NMI Detection Voltage
This function monitors for drops in the power-supply voltage. This function can be set up to monitor either
V

or Vout. When Vout is monitored, a low level is output from the

NMI pin if that voltage falls under the

detection voltage (4.63 V Typ). Then, when the power-supply voltage that fell rises again, the

NMI pin

will output a high level. Note that this function has a fixed hysteresis of 50 mV (Typ). The monitored
power supply is selected by connecting the NMIsns pin either to the V

pin or to the V

OUT

pin. When

detecting V

, an external adjustment resistor is required.)

The detection voltage can also be adjusted with the NMIadj pin.

STBY Detection Voltage
This function monitors for drops in the Vout voltage. It monitors the Vout voltage, and outputs a low level
from the

STBY pin if that voltage drops below the detection voltage (3.0 V Typ). Then, when the power-

supply voltage that fell rises again, the

STBY pin will output a high level. Note that this function has a

fixed hysteresis of 1.35 V (Typ).

The detection voltage can also be adjusted with the STBYadj pin.

HA16129AFPJ

Function Start Voltage

This is the minimum required Vout voltage for the

RES, NMI, STBY, and OUTE output pin functions to

start operating. It is stipulated as the voltage that Vout must reach after power is first applied for these pins
to output a low level.

Hysteresis

This is the difference between the LVI function detection voltage when the power-supply voltage drops,
and the clear (reset) voltage when the power-supply voltage rises.

HYSN

= V

NMI

; V

HYSS

= V

STBY

)

OUTE Function

When a microprocessor is in the runaway state, its outputs are undefined, and thus it is possible that the
outputs may be driven by incorrect signals. This function is used to mask such incorrect microprocessor
outputs. When the WDT function recognizes normal operation (when the

RES output is high), the OUTE

output will be held high. When the WDT function recognizes an abnormal state and an auto-reset pulse is
output from the

RES pin, the OUTE output will be held low. Thus microprocessor outputs during

microprocessor runaway can be masked by taking the AND of those outputs and this signal using external
AND gates.

The OUTE output will go high when the C

pin voltage exceeds VthHcr2, and will go low when that

voltage falls below VthLcr.

There are limitation that apply when the OUTE function is used. Refer to the calculation formulas item for
details.

RES Function

This period is the length of the high-level output period of the

RES pulse when the P-RUN signal from the

microprocessor stops. This is the time required for the C

potential to reach VthLcr from VthHcr1.

This period is the length of the low-level output period of the

RES pulse when the P-RUN signal from the

microprocessor stops. This is the time required for the C

potential to reach VthHcr1 from VthLcr.

OFF

This is the time from the point the P-RUN signal from the microprocessor stops to the point a low level is
output from the

RES pin. During normal microprocessor operation, the potential on the C

pin will be

about Vout

0.2 V (although this value may change with the P-RUN signal input conditions, so it should

be verified in the actual application circuit) and t

OFF

is the time for the C

pin potential to reach VthLcr

from that potential.

HA16129AFPJ

is the time from the point the

NMI output goes high when power is first applied to the point the RES

output goes low. t

is the time for the potential of the C

pin to reach VthHcr1 from 0 V.

tr
The time tr is the fixed delay time between the point the

NMI output goes from low to high after the power-

supply voltage comes up to the point

RES goes from low to high. The time tr is the time for the CRES pin

potential to fall from the high voltage (about 1.9 V) to Vthcres.

RES

The time t

RES

is the fixed delay time between the point the

NMI output goes from high to low when the

power-supply voltage falls to the point

RES goes from high to low. The time t

RES

is the time for the C

RES

potential to rise from 0 V to Vthcres.

WDT Function

This function determines whether the microprocessor is operating normally or has entered a runaway state
by monitoring the duty or frequency of the P-RUN signal. When this function recognizes a runaway state,
it outputs a reset pulse from the

RES pin and sets the OUTE pin to low from high. It holds the RES and

OUTE pins fixed at high as long as it recognizes normal microprocessor operation.

In this function, the potential of the Cf capacitor is controlled by the P-RUN signal. This Cf pin potential
charges the capacitor C

that controls the reset pulse to be between VthLcf and VthHcf. The judgment as

to whether or not the microprocessor is operating normally, is determined by the balance between the
charge and discharge voltage on the capacitor C

at this time.

HA16129AFPJ

Calculation Formulas

Item

Formula

Notes

Reference
voltage

Vout = 1.225 1 +

R1, R2; k

37 // R1
12 // R2

(

While the Vout voltage will be 5 V

1.5% when the

Voadj pin is open, the circuit shown here should be
used to change the Vout voltage externally.

Voadj

Vout

Short
detection
voltage

(700 mV Typ)

When this function operates, the base current to the
external transistor connected to the CS pin stops and
the Vout output is lowered.

Vout

OVP

This function prevents the microprocessor from being
damaged if the Vout voltage is inadvertently increased
to too high a level. The OVP detection voltage is fixed.

, t

= 3.3

= 1.1

These determine the reset pulse frequency and duty.

RES

= 1.1

Sets the time from the rise of the

NMI

signal to the point

the

RES

output is cleared.

NMI

RES

OFF

= 6.5

Sets the time from the point the P-RUN pulse stops to
the point a reset pulse is output.

RES

toff

P-RUN

HA16129AFPJ

Calculation Formulas (cont)

Item

Formula

Notes

STBY

= 1.48

67.6

29.5 + 36.2 // R1

+ 1

(

The voltage at which the

STBY

signal is output when

Vout falls. The

STBY

detection voltage can be adjusted

by connecting a resistor between the STBYadj pin and
ground (R3). However, the

STBY

recovery voltage

cannot be adjusted.

STBY

Vout

STBYadj

Vout

STBY

NMI

(Vout
detection)

NMI

= 1.2

1 +

R1, R2; k

R1 // 73
R2 // 25

(

The voltage at which the

NMI

signal is output when

Vout falls. (When NMIsns is connected to Vout.)

The

N M I

detection voltage can be adjusted by

connecting resistors between the NMIadj pin and Vout
(R1), and between the NMIadj pin and ground (R2).

NMI

Vout

NMI

NMIsns

NMIadj

GND

NMI

detection)

NMI

= 4.62

Recovery voltage

R2 // 97.1

(

+ 1

NMI

= 4.68

R1, R2; k

R2 // 45.5

(

+ 1

The voltage at which the

NMI

signal is output when V

falls. (When NMIsns is connected to V

The

N M I

detection voltage can be adjusted by

connecting resistors between the NMIsns pin and V

(R1), and between the NMIsns pin and ground (R2).

NMI

Vout

NMI

NMIsns

GND

OUTE

19.3

If the OUTE function is used, the relationship shown at
the left must be fulfilled to assure that pulses are not
incorrectly generated in this output when a
microprocessor runaway state is detected.

HA16129AFPJ

Absolute Maximum Ratings (Ta = 25

Item

Symbol

Rating

Unit

Power supply voltage

CS pin voltage

CONT pin current

Icont

CONT pin voltage

Vcont

Vout pin voltage

Vout

P-RUN pin voltage

PRUN

Vout

NMIsns pin voltage

NMIsns

NMI

pin voltage

NMI

Vout

STBY

pin voltage

STBY

Vout

RES

pin voltage

RES

Vout

OUTE pin voltage

OUTE

Vout

Power dissipation

400

Operating temperature

Topr

40 to +85

Storage temperature

Tstg

50 to +125

Note:

1. This is the allowable value when mounted on a 40

1.6 mm glass-epoxy printed circuit

board with a mounting density of 10% at ambient temperatures up to Ta = 77

C. This value must

be derated by 8.3 mW/

C above that temperature.

400

300

200

100

Power Dissipation P

(mW)

Ambient Temperature Ta (

140

100

120

HA16129AFPJ

Electrical Characteristics (Ta = 25

C, V

= 12V, Vout = 5.0V, Rf = R

= 180k

, Cf =

3300pF, C

= 0.1

F, R

= 390k

, C

RES

= 1500pF, R

= 0.2

)

Item

Symbol

Min

Typ

Max

Unit

Test
conditions

Power supply current

Short detection voltage

400

700

900

= (V

voltage

CS pin
voltage)

Regulator
block

Output voltage

Vout

4.925

5.00

5.075

= 12V,

Icont = 5mA

Input voltage stabilization Volin

6 to 17.5V,
Icont = 10mA

Load current stabilization Voload

Icont =
0.1 to 15mA

Ripple exclusion ratio

REJ

(45)

Vi = 0.5Vrms,
fi = 1kHz

Output voltage
temperature coefficient

Vout/

(200)

ppm/

C Icont = 5mA

Output voltage
adjustment range

oMAX

7.0

P-RUN
input block

Input high-level voltage

2.0

Input low-level voltage

0.8

Input high-level current

300

500

= 5.0V

Input low-level current

= 0.0V

NMI

output

block

High level

OHN

Vout

0.2 Vout

Vout + 0.2 V

OHN

= 0mA

Low level

OLN

0.4

OLN

= 2.0mA

Function start voltage

STN

0.7

1.4

STBY

output
block

High level

OHS

Vout

0.2 Vout

Vout + 0.2 V

OHS

= 0mA

Low level

OLS

0.4

OLS

= 2.0mA

Function start voltage

STS

0.7

1.4

Note:

Values in parentheses are design reference values.

HA16129AFPJ

Electrical Characteristics (Ta = 25

C, V

= 12V, Vout = 5.0V, Rf = R

= 180k

, Cf =

3300pF, C

= 0.1

F, R

= 390k

, C

RES

= 1500pF, R

= 0.2

) (cont)

Item

Symbol

Min

Typ

Max

Unit

Test
conditions

RES

output
block

High level

OHR

Vout

0.2 Vout

Vout + 0.2 V

OHR

= 0mA

Low level

OLR

0.4

OLR

= 2.0mA

Function start voltage

STR

0.7

1.4

OUTE
output
block

High level

OHE

Vout

0.2 Vout

Vout + 0.2 V

OHE

= 0mA

Low level

OLE

0.4

OLE

= 2.0mA

Function start voltage

STE

0.7

1.4

RES

function

Power on time

ton

Clock off time

toff

130

190

Reset pulse high time

Reset pulse low time

LVI
function

NMI

function
(Vout
detection)

Detection
voltage 1

NMI1

4.5

4.63

4.75

Hysteresis 1 V

HYSN1

100

Temperature
coefficient

NMI

100

(400)

ppm/

NMI

function
(V

detection)

Detection
voltage 2

NMI2

5.0

5.4

5.7

R1 = 13k

R2 = 390k

Hysteresis 2 V

HYSN2

0.5

0.8

1.3

R1 = 13k

R2 = 390k

STBY

function

Detection
voltage

STBY

2.70

3.00

3.30

Hysteresis

HYSS

1.20

1.35

1.50

Temperature
coefficient

STBY

100

(400)

ppm/

RES

delay time

Disable time

RES

(100)

200

(300)

Recovery time

(100)

200

(300)

Note:

Values in parentheses are design reference values.

HA16129AFPJ

Test Circuits

STBY

NMI

RES

Voadj

P-RUN

GND

RES

STBYadj

NMIsns

NMIadj

CONT

Vout

Icont

390k

3300p

0.1

180k

1500p

Here, the Vout voltage is for a V

of 12V, and Icont is monitored as
Vout is varied.

f = 1kHz
duty = 50%

STBY

NMI

RES

Voadj

P-RUN

GND

RES

STBYadj

NMIsns

NMIadj

CONT

Vout

390k

3300p

0.1

180k

1500p

f = 1kHz
duty = 50%

STBY

NMI

RES

Voadj

P-RUN

GND

RES

STBYadj

NMIsns

NMIadj

CONT

Vout

390k

3300p

0.1

180k

1500p

f = 1kHz
duty = 50%

Iout

Vout

= I

+ Iout

Vout test circuit

test circuit

Test circuit for other parameters

Units: Resistors

Capacitors F

Frequency

counter

R2
390k

R1
13k

NMI

Vout

detection

NMI

detection

HA16129AFPJ

HA16129AFPJ

System Circuit Examples

STBY

P-RUN

GND

Voadj

OUTE

STBYadj

NMIadj

NMIsns

CONT

OUT

RES

NMI

HA16129AFPJ

0.2

200

IGN

SW.

BATTERY

STBY

RES

NMI

PORT

(5 V)

Microprocessor

PORT

Load

To other power supplies

1500p

0.1

3300p

180k

390k

180k

STBY

P-RUN

GND

Voadj

OUTE

STBYadj

NMIadj

NMIsns

CONT

OUT

RES

NMI

HA16129AFPJ

0.2

200

STBY

RES

NMI

PORT

(5V)

Microprocessor

PORT

Load

1500p

0.1

3300p

180k

390k

180k

IGN

SW.

BATTERY

To other power supplies

Primary detection

Backup circuit

Example of a basic system

Example of a system using a backup circuit and a primary voltage monitoring circuit

Schottky diode
Zener diode

HA16129AFPJ

Cautions

1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent,

copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party's rights, including
intellectual property rights, in connection with use of the information contained in this document.

2. Products and product specifications may be subject to change without notice. Confirm that you have

received the latest product standards or specifications before final design, purchase or use.

3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,

contact Hitachi's sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.

4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly

for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-
safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.

5. This product is not designed to be radiation resistant.

6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without

written approval from Hitachi.

7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor

products.

Hitachi, Ltd.

Semiconductor & Integrated Circuits.
Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109

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URL

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: http://semiconductor.hitachi.com/

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: http://www.hitachi-eu.com/hel/ecg

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Tel : <852>-(2)-735-9218
Fax : <852>-(2)-730-0281
URL : http://semiconductor.hitachi.com.hk

Hitachi Europe GmbH
Electronic Components Group
Dornacher Straße 3
D-85622 Feldkirchen, Munich
Germany
Tel: <49> (89) 9 9180-0
Fax: <49> (89) 9 29 30 00

Hitachi Europe Ltd.
Electronic Components Group.
Whitebrook Park
Lower Cookham Road
Maidenhead
Berkshire SL6 8YA, United Kingdom
Tel: <44> (1628) 585000
Fax: <44> (1628) 585200

Hitachi Semiconductor
(America) Inc.
179 East Tasman Drive,
San Jose,CA 95134
Tel: <1> (408) 433-1990
Fax: <1>(408) 433-0223

For further information write to:

Colophon 3.0

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