BU9817FV Rohm, BU9817FV Datasheet - Page 8

• Manufacturer Part Number: BU9817FV
• Description: 4-channel temperature sensor IC for PCs with I2C BUS interface
• Manufacturer: Rohm

Multimedia ICs
!Circuit operation
Explanation of operating mode
The asterisk can be either 0 or 1.
∗
∗
∗
Explanation of ADC / open drain operation
ADC operation
ADC operation
Normal mode
Interval High mode
Interval Low mode
Shutdown mode
Reset mode
(Normal mode)
(Interval mode)
Conversion time is for fCLK = 32.768kHz.
These mode setting bits (bit 0 and bits 3 to 5) are common for each channel, the last setting of bits (bit0 and bits3 to 5) is
effective for all channels. Furthermore, bits 1 and 2 are independent and can be set for each channel.
Note: These parameters are reference values derived through calculations and are not guaranteed characteristic values.
Operating mode
OD1
OD2
OD3
OD4
OD1
OD2
OD3
OD4
4ch
10 clock
10 clock 10 clock
1ch
register settings
Configuration
00
00000
00110
00100
00000
Tad = 1.221ms, 40 clock
∗∗
1
∗∗
∗∗
∗∗
∗∗
2ch
1ch
∗∗∗
0b
0b
0b
1b
Tc = 1.831ms, 60 clock
b
3ch
2ch
conversion interval
1 second intervals
4 second intervals
ADC operation
1.221ms
Stopped
Stopped
4ch
3ch
Tin = 1s, 4s
1ch
4ch
Reset fixed at high
A / D conversion
A / D conversion
A / D conversion
operation timing
10th clock after
10th clock after
10th clock after
2ch
1ch
Open drain
Hold status
3ch
4ch
Normal operation
Normal operation
Normal operation
Register status
Data reset
Hold data
1ch
10 clock
1ch
consumption (typ.)
BU9817FV
Less than 1µA
Less than 1µA
Note: average
Note: average
less than 3µA
less than 2µA
0.75mA
Current
2ch
3ch