BU9817FV
Multimedia ICs
4-channel temperature sensor IC for
PCs with I
2
C BUS interface
BU9817FV
The BU9817FV is a 4-channel, 8-bit, A / D converter / overvoltage detector that is perfect for temperature sensors with
built-in I
2
C BUS interfaces. The host can access the BU9817FV anytime for the voltage data.
!Applications
Notebook computers, desktop computers, household
electric appliances
!Features
1) By attaching a thermistor, a maximum four-channel
temperature sensor is possible.
2) Can set comparison voltages independently.
3) Built-in I
2
C BUS interface.
4) Detection level and operating mode settings are pro-
grammable.
5) Extremely low operating current perfect for portable
equipment.
6) Operating voltage of V
DD
= 3V to 5.5V.
!
!
!
!Absolute maximum ratings
(Ta = 25C)
Parameter
Symbol
Limits
Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Voltage applied to pins
V
DD
Pd
Topr
Tstg
V
IN
7.0
350
15 ~ + 75
55 ~ +125
GND 0.5 ~ V
DD
+ 0.5
V
mW
C
C
V
* Reduced by 3.5mW for each increase in Ta of 1C over 25C.
!
!
!
!Recommended operating conditions
(Ta = 25C)
Parameter
Symbol
Unit
Max.
Typ.
Min.
Operating power supply voltage
V
DD
3.0
5.5
--
V
Note) I
2
C BUS is a registered trademark philips.
BU9817FV
Multimedia ICs
!
!
!
!Block diagram
I
2
C BUS Interface
Vdl
Register
Vul
Register
Pointer
Register
Configuration
Register
Reset & Shutdown
Reset
Voltage
Hysteresis
Comparator
ADV
Register
Reset
Voltage
Hysteresis
Comparator
ADV
Register
Reset
Voltage
Hysteresis
Comparator
ADV
Register
Reset
Voltage
Hysteresis
Comparator
ADV
Register
8bit
A / D
Reset
Shutdown
Sel
Sel
14
V
DD
13
STOPB
12
11
10
9
8
AD1
AD2
AD3
AD4
CLK
1
2
3
4
5
6
7
SDA
SCL
OD1
OD2
OD3
OD4
GND
BU9817FV
Multimedia ICs
!
!
!
!Pin descriptions
Pin No.
Pin name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SDA
SCL
OD1
OD2
OD3
OD4
GND
CLK
AD4
AD3
AD2
AD1
STOPB
V
DD
I
2
C BUS Serial Data Line
I
2
C BUS Serial Clock Input
Open Drain Output 1
Open Drain Output 2
Open Drain Output 3
Open Drain Output 4
Ground
Clock for Logic Input
Analog-to-Digtal Converter Input 4
Analog-to-Digtal Converter Input 3
Analog-to-Digtal Converter Input 2
Analog-to-Digtal Converter Input 1
Reset & Power save mode set
Supply Voltage 3.0V to 5.5V
BU9817FV
Multimedia ICs
!
!
!
!Input / output equivalent circuits
Pin. No
Pin name
Input / output circuits
Function
1
2
7
8
3
4
5
6
SDA
SCL
GND
CLK
OD1
OD2
OD3
OD4
I
2
C BUS serial data input / output.
When only input address accords slave
address (BU9817FV's), register data is
inputted or outputted.
I
2
C BUS serial clock input.
Open-drain output corresponds to AD1 to
AD4 input.
Connect this pin a pull-up resister.
The pull-up resister should be above V
DD
/
4mA (
).
Ground terminal.
Clock input for ADC block.
Input clock is 32.768kHz.
AD converter and voltage hysteresis
comparator use this clock to operate.
BU9817FV
Multimedia ICs
!
!
!
!Input / output equivalent circuits
Pin. No
Pin name
Input / output circuits
Function
13
14
9
10
11
12
STOPB
V
DD
AD1
AD2
AD3
AD4
AD input.
Each channel is converted in order.
(AD1, AD2, AD3, AD4, AD1,AD2...)
Reset and power save mode setting.
High: Operation mode
Operation follows the setting of
configuration register.
Low : Reset & Power save mode
Reset the all internal circuit and stop
the ADC operation.
Go into power save mode.
Be sure to set STOPB pin low for initial
reset of the internal circuit, when the
BU9816FV is power up.
Power supply.
Supply voltage 3.0V to 5.5V.
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