BU9817FV Rohm, BU9817FV Datasheet
BU9817FV
Available stocks
Related parts for BU9817FV
BU9817FV Summary of contents
Page 1
... IC for 2 PCs with I C BUS interface BU9817FV The BU9817FV is a 4-channel, 8-bit converter / overvoltage detector that is perfect for temperature sensors with 2 built- BUS interfaces. The host can access the BU9817FV anytime for the voltage data. !Applications ...
Page 2
... Reset Voltage Hysteresis Comparator GND BUS Interface Pointer Configuration Register Register Vul Reset & Shutdown Register ADV Register ADV Register Sel ADV Register ADV Register BU9817FV STOPB Reset Shutdown 12 AD1 11 AD2 8bit Sel AD3 9 AD4 8 CLK ...
Page 3
... Clock for Logic Input 9 AD4 Analog-to-Digtal Converter Input 4 10 AD3 Analog-to-Digtal Converter Input 3 11 AD2 Analog-to-Digtal Converter Input 2 12 AD1 Analog-to-Digtal Converter Input 1 13 STOPB Reset & Power save mode set 14 V Supply Voltage 3.0V to 5.5V DD BU9817FV Function ...
Page 4
... GND 8 CLK Input / output circuits BUS serial data input / output. When only input address accords slave address (BU9817FV's), register data is inputted or outputted 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 4mA (Ω ...
Page 5
... 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. BU9817FV Function Operation follows the setting of configuration register. Reset the all internal circuit and stop the ADC operation. Go into power save mode. ...
Page 6
... LSB 1 – 1 — LSB µs — — 305 GND — BU9817FV Conditions SDA, SCL = “H” CLK = 32.768kHz SDA, SCL = “H” CLK = 32.768kHz Mode setting or STOPB = Low — — — — — loL = 4.0mA loL = 6.0mA CL = 400pF loL = 6.0mA — ...
Page 7
... Multimedia ICs !Measurement circuit 820Ω 820Ω 820Ω BUS Controller 820Ω 1.2kΩ 1.2kΩ 1.2kΩ 1.2kΩ Fig.1 BU9817FV 32.768kHz ...
Page 8
... Hold status Stopped Reset fixed at high 3ch 4ch 1ch 2ch 3ch Tin = 1s, 4s 2ch 3ch 4ch 1ch BU9817FV Current Register status consumption (typ.) Normal operation 0.75mA Note: average Normal operation less than 3µA Note: average Normal operation less than 2µA Hold data Less than 1µ ...
Page 9
... SCL SDA (Data conditions) SCL SDA t SU: DAT (Stop conditions) SCL SDA 1 1 Min. Max. Unit 0 400 kHz µs 0.6 — µs 0.6 — 100 — ns µs 0 0.9 µs 0.6 — t SU: STA t HD: STA t HD: DAT t SU: STO BU9817FV LSB ...
Page 10
... Mode) OD Output (Interrupt Mode) * Note: Resetting OD output under interrupt mode occurs at only shutdown mode or reset mode or STOPB or when data read generated from host. Except for these cases, OD output is kept setting. ∗ ∗ Read Read BU9817FV AD pin voltage waveform ∗ Read Time ...
Page 11
... Pointer reg. Byte A Address R A Read Data Byte — Read Data Byte P A BU9817FV 1ch Configuration Register 1ch Vdl Register 1ch Vul Register 1ch ADV Register 2ch Configuration Register 2ch Vdl Register 2ch Vul Register 2ch ADV Register 3ch Configuration Register ...
Page 12
... Opendrain Polarity Opendrain Interval Polarity Reset Speed Opendrain Polarity Opendrain Polarity BU9817FV bit1 LSB bit1 LSB bit1 LSB bit1 LSB D1 D0 Comp. / Int. Comp. / Int. Shutdown Comp. / Int. Comp. / Int. ...
Page 13
... Multimedia ICs Mode settings table Shutdown “0” - Operation mode. “1” - The BU9817FV stops operation and goes into low power shutdown mode. D0 bit of each channel is common bit Comparator / Interrupt mode “0” - Comparator mode. “1” - Interrupt mode. ...
Page 14
... OD2 Output 4 OD3 Output 5 OD4 Output STOPB Input (From Reset IC) 13 Power on Reset AD1 Input AD2 Input 10 AD3 Input 9 AD4 Input 8 CLK Input (fCLK = 32.768kHz) Fig.2 BU9817FV Thermal Zone RTH Thermal Zone RTH RTH: NTC Thermistor ...
Page 15
... In other words, the resistance temperature coefficient is negative, and so the AD input pin voltage temperature characteristics are also negative ADx BU9817FV GND is required common and stability External dimensions (Units : mm) 5.0 ± 0 0.22 ± 0.1 0.65 0.3Min. SSOP-B14 Put nearby BU9817FV Put nearby measured object 0.1 BU9817FV NTC thermistor ...