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BU9817FV Dataheets PDF



Part Number BU9817FV
Manufacturers Rohm
Logo Rohm
Description 4-channel temperature sensor IC for PCs with I2C BUS interface
Datasheet BU9817FV DatasheetBU9817FV Datasheet (PDF)

BU9817FV Multimedia ICs 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 .

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BU9817FV Multimedia ICs 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 programmable. 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 Power supply voltage Power dissipation Operating temperature Storage temperature Voltage applied to pins Symbol VDD Pd Topr Tstg VIN Limits 7.0 350 – 15 ~ + 75 – 55 ~ +125 GND – 0.5 ~ VDD + 0.5 Unit V mW ˚C ˚C V * Reduced by 3.5mW for each increase in Ta of 1˚C over 25˚C. !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. BU9817FV Multimedia ICs !Block diagram SDA 1 I2C BUS Interface 14 VDD Vdl Register SCL 2 Pointer Register Configuration Register 13 STOPB Vul Register Reset & Shutdown OD1 3 Reset Voltage Hysteresis Comparator Reset Shutdown ADV Register 12 AD1 OD2 4 Reset Voltage Hysteresis Comparator 11 ADV Register AD2 Sel 8bit A/D Sel OD3 5 Reset Voltage Hysteresis Comparator 10 ADV Register AD3 OD4 6 Reset Voltage Hysteresis Comparator 9 AD4 ADV Register GND 7 8 CLK BU9817FV Multimedia ICs !Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin name SDA SCL OD1 OD2 OD3 OD4 GND CLK AD4 AD3 AD2 AD1 STOPB VDD I2C BUS Serial Data Line Function I2C 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 SDA I2C BUS serial data input / output. When only input address accords slave address (BU9817FV's), register data is inputted or outputted. 2 SCL I2C BUS serial clock input. 3 4 5 6 OD1 OD2 OD3 OD4 Open-drain output corresponds to AD1 to AD4 input. Connect this pin a pull-up resister. The pull-up resister should be above VDD / 4mA (Ω). 7 GND Ground terminal. 8 CLK 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 9 10 11 12 AD1 AD2 AD3 AD4 AD input. Each channel is converted in order. (AD1, AD2, AD3, AD4, AD1,AD2...) 13 STOPB 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. 14 VDD Power supply. Supply voltage 3.0V to 5.5V. BU9817FV Multimedia ICs !Electrical characteristics (unless otherwise noted, VDD = 5.0V, Ta = 25°C) Parameter Circuit current (normal) Symbol ICC Min. 0.2 Typ. 0.75 Max. 2.0 Unit mA 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 — Circuit current (shutdown / reset / STOPB) Input high level voltage Input low level voltage Input high level current Input low level current Input capacity Open drain output low level voltage SDA output low level voltage SDA output fall time STOPB minimum pulse width 〈STOPB minimum pulse width〉 VDD ICC.sd — VDD × 0.7 – 0.5 — – 1.0 — 0.0 0.0 — 10 1.0 2.0 µA V V µA µA pF V V ns µs ViH ViL IiH IiL Ci VoLod VoLsda tfsda pwstopb VDD 0.0 0.0 0.0 — 0.2 0.2 — — VDD + 0.5 VDD × 0.3 1.0 — 10 0.6 0.6 250 — GND 0.3VDD Minimum pulse width 〈A / D〉 AD resolution Non-linearity error Differential non-linearity error 1-channel conversion time Input range RES Nle Ndle Tc Ai — –2 –1 — GND 8 — — 305 — — 2 1 — VDD bits LSB LSB µs V 2 points connected fCLK = 32.768kHz — — — BU9817FV Multimedia ICs !Measurement circuit 820Ω 820Ω 820Ω I2C BUS Controller A 2 13 820Ω 3 1.2kΩ 12 4 1.2kΩ 11 5 1.2kΩ 10 6 1.2kΩ 9 32.768kHz 7 8 A Fig.1 N N N N A A A 1 V V V V V V 14 BU9817FV Multimedia ICs !Circuit operation Explanation of operating mode Operating mode Normal mode Interval High mode Interval Low mode Shutdown mode Reset mode Configura.


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