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PDF BU9817FV Data sheet ( Hoja de datos )
| Número de pieza | BU9817FV | |
| Descripción | 4-channel temperature sensor IC for PCs with I2C BUS interface | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
BU9817FV
4-channel temperature sensor IC for
PCs with I2C 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 I2C 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 I2C 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 VDD = 3V to 5.5V.
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
VDD
7.0
Power dissipation
Pd
350
Operating temperature
Topr
– 15 ~ + 75
Storage temperature
Tstg
– 55 ~ +125
Voltage applied to pins
VIN GND – 0.5 ~ VDD + 0.5
* Reduced by 3.5mW for each increase in Ta of 1˚C over 25˚C.
Unit
V
mW
˚C
˚C
V
!Recommended operating conditions (Ta = 25°C)
Parameter
Operating power supply voltage
Symbol
VDD
Min.
3.0
Typ.
—
Max.
5.5
Unit
V
Note) I2C BUS is a registered trademark philips.
1 page  
Multimedia ICs
!Input / output equivalent circuits
Pin. No
Pin name
Input / output circuits
9 AD1
10 AD2
11 AD3
12 AD4
13 STOPB
14 VDD
BU9817FV
Function
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.
5 Page 
Multimedia ICs
!Circuit operation
Register structure
BU9817FV
1ch Configuration Register
1ch Vdl Register
1ch Vul Register
1ch ADV Register
SDA
SCL
I2C BUS
Interface
Pointer
Register
(Register select)
2ch Configuration Register
2ch Vdl Register
2ch Vul Register
2ch ADV Register
3ch Configuration Register
3ch Vdl Register
3ch Vul Register
3ch ADV Register
4ch Configuration Register
4ch Vdl Register
4ch Vul Register
4ch ADV Register
I2C Bus data structure
(1) Write Mode
S Address
—W A Pointer reg. Byte A Write Data Byte A P
(2) Read Mode
1) Pointer register set
S Address
—W A Pointer reg. Byte
A
Sr Address
R A Read Data Byte
—A P
2) Preset pointer register
S Address
RA
Read Data Byte
—A P
S: Start condition
P: Stop condition
Sr: Restart condition
A: acknowledge
—A: acknowledge bar
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet BU9817FV.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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