ADT7476A データシートの表示（PDF） - Analog Devices
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ADT7476A Datasheet PDF : 72 Pages
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ADT7476A
FRONT
CHASSIS
FAN
ADT7476A
TACH2
PWM1
TACH1
REAR
CHASSIS
FAN
AMBIENT
TEMPERATURE
PWM3
TACH3 VID[0:4]/VID[0:5]
D2+
5(VRM9)/6(VRM10)
D2–
THERM
D1+
PROCHOT
D1–
VCC
SDA
+5VIN
SCL
+12VIN/VID5 SMBALERT
GND
Figure 13. ADT7476A Configuration
SERIAL BUS INTERFACE
Control of the ADT7476A is carried out using the serial system
management bus (SMBus). The ADT7476A is connected to this
bus as a slave device, under the control of a master controller.
The ADT7476A has a 7-bit serial bus address. When the device
is powered up with Pin 13 (PWM3/ADDREN) high, the
ADT7476A has a default SMBus address of 0101110 or 0x2E.
The read/write bit must be added to get the 8-bit address.
If more than one ADT7476A is to be used in a system, each
ADT7476A is placed in ADDR SELECT mode by strapping
Pin 13 low on power-up. The logic state of Pin 14 then
determines the device’s SMBus address. The logic of these
pins is sampled on power-up.
The device address is sampled on power-up and latched on
the first valid SMBus transaction, more precisely on the low-to-
high transition at the beginning of the eighth SCL pulse, when
the serial bus address byte matches the selected slave address.
The selected slave address is chosen using the ADDREN pin/
ADDR SELECT pin. Any attempted changes in the address
have no effect after this.
Table 5. Hardwiring the ADT7476A SMBus Device Address
Pin 13 State Pin 14
Address
0
Low (10 kΩ to GND)
0101100 (0x2C)
0
High (10 kΩ pull-up)
0101101 (0x2D)
1
Don’t Care
0101110 (0x2E)
ADT7476A
VCC
ADDR SELECT 14
PWM3/ADDREN 13
10kΩ
ADDRESS = 0x2E
Figure 14. Default SMBus Address = 0x2E
ADT7476A
ADDR SELECT
14 10kΩ
13
PWM3/ADDREN
ADDRESS = 0x2C
Figure 15. SMBus Address = 0x2C (Pin 14 = 0)
ADT7476A
ADDR SELECT
VCC
10kΩ
14
PWM3/ADDREN 13
ADDRESS = 0x2D
Figure 16. SMBus Address = 0x2D (Pin 14 = 1)
Rev. 0 | Page 11 of 72
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