L98SI
OCTAL SERIAL SOLENOID DRIVER
.
EIGHT LOW R
DSon
DMOS OUTPUTS
(0.5
AT I
O
= 1A @ 25
C V
CC
= 5V
5%)
.
8 BIT SERIAL INPUT DATA (SPI)
.
8 BIT SERIAL DIAGNOSTIC OUTPUT FOR
OVERLOADAND OPENCIRCUIT CONDITIONS
.
OUTPUT SHORT CIRCUIT PROTECTION
.
CHIP ENABLE SELECT FUNCTION (active low)
.
INTERNAL 36V CLAMPING FOR EACH OUT-
PUT
.
CASCADABLE
WITH
ANOTHER
OCTAL
DRIVER
.
LOW QUIESCENT CURRENT (10mA MAX.)
.
PACKAGE PowerSO20
DESCRIPTION
The L98SI is an octal low side solenoiddriver rea
lized in Multipower-BCD technologyparticularlysui-
ted for driving lamps, relays and solenoids in indu-
BLOCK DIAGRAM
PowerSO20
ORDERING NUMBER: L98SI
strial environment. The L98SI DMOS outputshave
very low power consumption.
Data is transmitted serially to the device using the
Serial Peripheral Interface (SPI) protocol.
The L98SI features the outputs status monitoring
function.
MULTIPOWER BCD TECHNOLOGY
April 1998
1/9
PIN CONNECTION (top view)
GND
SO
V
DD
RESET
OUT7
OUT5
OUT6
OUT4
N.C.
N.C.
OUT3
OUT2
OUT0
OUT1
CE
SCLK
SI
GND
1
3
2
4
5
6
7
8
9
18
17
16
15
14
12
13
11
19
10
20
GND
GND
D94AT119
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-case
Thermal Resistance Junction-Case
Max.
1.5
C/W
R
th j-amb
Thermal Resistance Junction-Ambient
Max.
60
C/W
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
DD
DC Logic Supply
0.7
7
V
V
O
Output Voltage
internally clamped
V
I
I
Input Transient Current
(CE, SI, SCLK, RESET, SO) :
Duration Time t = 1s,
V
I
< 0
V
I
> V
CC
25
+ 25
mA
mA
I
Odc
Continuous Output Current (for each output)
Int. Limited
A
T
j
, T
stg
Junction and Storage Temperature Range
40
150
C
E
X
Max Clamping Energy (for each output)
200
mJ
L98SI
2/9
V
CC
Logic supply voltage - nominally 5V
GROUND
Device Ground.This ground applies for the logic cir-
cuits as well as the power output stages.
RESET
Asynchronousreset for the outputstages,the paral-
lel latch and the shift register inside the L98SI. This
pin is active low and it must not be left floating. A po-
wer on clear function may be implemented connec-
ting this pin to V
CC
with an external resistor and to
ground with an external capacitor.
CE
Chip Enable. Data is transferred from the shift regi-
sters to the outputs on the rising edge of this signal.
The falling edge of this signal sets the shift register
with the output voltage sense bits coming from the
output stages. The output driver for the SO pin is
enabled when this pin is low.
SO
Serial Output. This pin is the serial output from the
shift register and it is tri-stated when CE is high. A
high for a data bit on this pin indicates that the par-
ticular output is high. A low on this pin for a data bit
indicates that the output is low.
Comparing the serial output bits with the previous
serial input bits the external microcontroller imple-
ments the diagnostic data supplied by the L98SI.
SI
Serial Input. This pin is the serial data input. A high
on thispin will program a particular outputto be OFF,
while a low will turn it ON.
SCLK
Serial Clock. This pin clocks the shift register. New
SO data will appear on every rising edge of this pin
and new SI data will be latched on every SCLK's fal-
ling edge into the shift register.
OUTPUTS 00-07
Power output pins. The input and outputbits corres-
pondingto 07 are sent and received first via the SPI
bus and 00 is the last. The outputsare provided with
current limiting and voltage sense functions for fault
indication and protection. The nominal load current
for these outputs is 500mA, but the current limiting
is set to a minimum of 1.05A.The outputsalso have
on board clamps set at about 36V for recirculation
of inductive load current.
PIN DESCRIPTION
ELECTRICAL CHARACTERISTICS (V
CC
= 5V
5%. T
j
= 40 to 125
C ; unless otherwise speciifed)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
OC
Output Clamping Volt.
I
O
= 0.5A, Output Programmed OFF
30
40
V
I
Oleak
Out. Leakage Current
V
O
= 24V, Output Progr. OFF
1
mA
R
DSon
On Resistance
Output Progr. ON
I
O
= 0.5A
I
O
= 0.8A
I
O
= 1A
With Fault Reset Disabled
0.55
0.55
0.55
1
1
1
I
OL
Out. Self Limiting
Current
Output Progr. ON
1.05
A
t
PHL
Turn-on Delay
I
O
= 500mA
No Reactive Load
10
s
t
P
Turn-off Delay
I
O
= 500mA
No Reactive Load
10
s
V
OREF
Fault Refer. Voltage
Output Progr. OFF
Fault detected if V
O
> V
OREF
1.6
2
V
t
UD
Fault Reset Delay
(after CE L to H
transition)
See fig. 3
75
250
s
V
OFF
Output OFF Voltage
Output Pin Floating.cOutput Progr. OFF,
1.0
V
L98SI
3/9
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
INPUT BUFFER (SI, CE, SCLK and RESET pins)
V
T
Threshold Voltage at
Falling Edge
SCLK only
V
CC
= 5V
10%
0.2V
CC
0.6
V
V
V
T+
Threshold Voltage at
Rising Edge
SCLK only
V
CC
= 5V
10%
0.7V
CC
4.15
V
V
V
H
Hysteresis Voltage
V
T+
V
T
0.85
2.5
V
I
I
Input Current
V
CC
= 5.50V, 0 < V
I
< V
CC
10
+ 10
A
C
I
Input Capacitance
0 < V
I
< V
CC
20
nF
OUTPUT BUFFER (SO pin)
V
SOL
Output LOW Voltage
I
O
= 1.6mA
0.4
V
V
SOH
Output HIGH Voltage
I
O
= 0.8mA
V
CC
1.3V
V
I
SOtl
Output Tristate Leakage
Current
0 < V
O
< V
CC
, CE Pin Held High,
V
CC
= 5.25V
20
20
A
C
SO
Output Capacitance
0 < V
O
< V
CC
CE Pin Held High
20
pF
I
CC
Quiescent Supply
Current at V
CC
Pin
All Outputs Progr. ON. I
O
= 0.5A
per Output Simultaneously
10
mA
SERIAL PERIPHERAL INTERFACE (see fig. 2, timing diagram)
f
op
Operating Frequency
D.C.
2
MHz
t
lead
Enable Lead Time
250
ns
t
lag
Enable Lag Time
250
ns
t
wSCKH
Clock HIGH Time
200
ns
t
wSCKL
Clock LOW Time
200
ns
t
su
Data Setup Time
75
ns
t
H
Data Hold Time
75
ns
t
EN
Enable Time
250
ns
t
DIS
Disable Time
250
ns
t
V
Data Valid Time
100
ns
t
rSO
Rise Time (SO output)
V
CC
= 20 to 70% C
L
= 200pF
50
ns
t
fSO
Fall Time (SO output)
V
CC
= 70 to 20% C
L
= 200pF
50
ns
t
rSI
Rise Time SPI
Inputs (SCK, SI, CE)
V
CC
= 20 to 70% C
L
= 200pF
200
ns
t
fSI
Fall Time SPI
Inputs (SCLK, SI, CE)
V
CC
= 70 to 20% C
L
= 200pF
200
ns
t
ho
Output Data Hold Time
0
s
L98SI
4/9
The L98SIDMOS outputis a lowoperatingpowerde-
vice featu-ring, eight 1
R
DSON
DMOS drivers with
transient protection circuits in output stages. Each
channel is independently controlled by an output
latch and a common RESET line which disables all
eightoutputs.The driver has low saturationandshort
circuitprotectionandcan driveinductiveandresistive
loads such as solenoids, lamps and relais. Data is
transmitted to the device serially using the Serial Pe-
ripheral Interface (SPI) protocol. The circuit receives
8 bitserial databy meansof the serial input(SI) which
is stored in an internal register to control the output
drivers. The serial output (SO) provides 8 bit of dia-
gnostic data representingthe voltagelevel at the dri-
ver output. This allows the microprocessor to
diagnose the condition of the output drivers.
The output saturation voltage is monitored by a
comparator for an out of saturation condition and is
able to unlatch the particular driver through the fault
reset line. This circuit is also cascadable with ano-
ther octal driver in order to jam 8 bit multiple data.
The device is selected when the chip enable (CE)
line is low.
Additionally the (SO) is placed in a tri-state mode
when the device is deselected. The negative edge
of the (CE) transfers the voltage level of the drivers
to the shift register and the positive edge of the (CE)
latchesthe new datafrom the shift register to the dri-
vers. When CE is Low, data bit contained into the
shift register is transferred to SO output at every
SCLK positive transition while data bit present at SI
input is latched into the shift register on every SCLK
negative transition.
Internal Blocks Description
The internal architecture of the device is based on
the three internal major blocks : the octal shift regi-
ster for talking to the SPI bus, the octal latch for hol-
ding control bits written into the device and the octal
load driver array.
Shift Register
The shift register has both serial and parallel inputs
and serial and parallel outputs. The serial input ac-
cepts data from the SPI bus and the serial output si-
multaneously sends data into the SPI bus. The
parallel outputs are latched into the parallel latch in-
side the L98SI at the end of a data transfer. The pa-
rallel inputsjam diagnosticdatainto the shift register
at the beginning of a data transfer cycle.
Parallel Latch
The parallel latch holds the input data from the shift
register. This data then actuates the output stages.
Individual registers in the latch may be cleared by
fault conditions in order to protect the overloaded
output stages. The entire latch may also be cleared
by the RESET signal.
Output Stages
The output stagesprovide an active low drive signal
suitable for 0.75A continuous loads. Each output
has a current limit circuit which limits the maximum
output current to at least 1.05A to allow for high in-
rush currents. Additionally,the outputshaveinternal
zeners set to 36 volts to clamp inductive transients
at turn-off. Each output also has a voltage compa-
rator observing the outputnode. If the voltage exce-
eds 1.8V on an ON output pin, a fault condition is
assumed and the latch driving this particular stage
is reset, turning the output OFF to protect it. The ti-
ming of this action is described below. These com-
parators also provide diagnostic feedback data to
the shift register. Additionally, the comparators con-
tain an internalpulldowncurrentwhich will causethe
cell to indicate a low output voltage if the output is
programmed OFF and the output pin is open circui-
ted.
TIMING DATA TRANSFER
Figure #2 shows the overall timing diagram from a
byte transfer to and from the L98SI using the SPI
bus.
CE High to Low Transition
The action begins when the Chip Enable(CE) pin is
pulledlow. The tri-state Serial Output(SO) pin driver
will be enabledentire time that CE is low. At the fal-
ling edge of the CE pin, the diagnostic data from the
voltage comparators in the output stages will be lat-
ched into the shift register. If a particular output is
high, a logic one will be jammed into that bit in the
shift register. If the output is low, a logic zero will be
loaded there. The most significant bit (07) shouldbe
presented at the Serial Input (SI) pin. A zero at this
pin will program an output ON, while a one will pro-
gram the output OFF.
SCLK Transitions
The Serial Clock (SCLK) pin should then be pulled
high. At thispoint the diagnostic bit from the most si-
gnificantoutput(07) will appearat the SO pin. A high
here indicates that the 07 pin is higher than 1.8V.
The SCLK pin shouldthen be toggledlow then high.
New SO data will appearfollowing every rising edge
of SCLK and new SI data will be latched into the
L98SIshift registeron the fallingedges.An unlimited
amount of data may be shifted through the device
FUNCTIONAL DESCRIPTION
L98SI
5/9
shift register (into the SI pin and out the SO pin), al-
lowing theotherSPI devicesto becascadedin a dai-
sy chain with the L98SI.
CE Low to High Transition
Once the last data bit has been shifted into the
L98SI, the CE pin should be pulled high.
At the rising edge of CE the shift register data is lat-
ched into the parallel latch and the outputstageswill
be actuated by the new data. An internal 160
s de-
lay timer will also be started at this rising edge (see
t
UD
). During the 160
s period, the outputs will be
protected only by the analog current limiting circuits
since the resetting of the parallel latches by faults
conditionswill be inhibited duringthis period.This al-
lows the part to overcome any high inrush currents
that may flow immediately after turn on. Once the
delay period has elapsed, the output voltages are
sensed by the comparators and any output with vol-
tageshigher than 1.8V arelatched OFF. It shouldbe
noted that the SCLK pin should be low at both tran-
sitions of the CE pin to avoid any false clocking of
the shift register. The SCLK input is gatedby the CE
pin, so that the SCLK pin is ignored whenever the
CE pin is high.
FAULT CONDITIONS CHECK
Checking for fault conditions may be done in the fol-
lowing way. Clock in a new control byte. Wait 160
microseconds or so to allow the outputs to settle.
Clock in thesame controlbyte and observethe diag-
nostic data that comes out of the device. The diag-
nostic bits should be identical to the bits that were
first clocked in. Any differenceswould point to a fault
on that output.If the outputwas programmed ON by
clocking in a zero, and a one came back as the dia-
gnosticbit forthat output,the outputpinwasstill high
and a short circuit or overload condition exists. If the
output was programmed OFF by clocking in a one,
and a zero came back as the diagnostic bit for that
output, nothing had pulled the output pin high and it
Figure 1 : Byte Timing with Asynchronous Reset.
L98SI
6/9
Figure 2 : Timing Diagram.
Figure 3 : Typical Application Circuit.
L98SI
7/9
e
a2
A
E
a1
PSO20MEC
DETAIL A
T
D
1
10
11
20
E1
E2
h x 45
DETAIL A
lead
slug
a3
S
Gage Plane
0.35
L
DETAIL B
R
DETAIL B
(CO PLANARITY)
G
C
- C -
SEATING PLANE
e3
b
c
N
N
POWERSO20 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
3.6
0.142
a1
0.1
0.3
0.004
0.012
a2
3.3
0.130
a3
0
0.1
0.000
0.004
b
0.4
0.53
0.016
0.021
c
0.23
0.32
0.009
0.013
D (1)
15.8
16
0.622
0.630
D1
9.4
9.8
0.370
0.386
E
13.9
14.5
0.547
0.570
e
1.27
0.050
e3
11.43
0.450
E1 (1)
10.9
11.1
0.429
0.437
E2
2.9
0.114
E3
5.8
6.2
0.228
0.244
G
0
0.1
0.000
0.004
H
15.5
15.9
0.610
0.626
L
0.8
1.1
0.031
0.043
N
10
(max.)
S
8
(max)
T
10
0.394
(1) "D and F" do not include mold flash or protrusions.
- Mold flash or protrusions shall not exceed 0.15 mm (0.006").
- Critical dimensions: "E", "G" and "a3"
L98SI
8/9
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously
supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems
without express written approval of SGS-THOMSON Microelectronics.
1998 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved
PowerSO-20
TM
is a Trademark of SGS-THOMSON Microelectronics
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
L98SI
9/9
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