adt7476a Analog Devices, Inc., adt7476a Datasheet - Page 59

• Manufacturer Part Number: adt7476a
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

Table 34. PWM Configuration Registers
Register Address
0x5C
0x5D
0x5E
Bit
[2:0]
[3]
[4]
[7:5]
1
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to these registers fail.
Name
SPIN
RES
INV
BHVR
R/W
Read/Write
Read/Write
Read/Write
R/W
Read/Write
N/A
Read/Write
Read/Write
1
Description
PWM1 configuration.
PWM2 configuration.
PWM3 configuration.
Description
These bits control the startup timeout for PWMx. The PWM output stays high until
two valid TACH rising edges are seen from the fan. If there is not a valid TACH signal
during the fan TACH measurement directly after the fan startup timeout period, the
TACH measurement reads 0xFFFF and Interrupt Status Register 2 reflects the fan
fault. If the TACH minimum high and low bytes contain 0xFFFF or 0x0000, the
Interrupt Status Register 2 bit is not set, even if the fan has not started.
000 = No startup timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
100 = 667 ms
101 = 1 sec
110 = 2 sec
111 = 4 sec
Reserved. Do not write to this bit.
This bit inverts the PWM output. The default is 0, which corresponds to a logic high
output for 100% duty cycle. Setting this bit to 1 inverts the PWM output, so 100%
duty cycle corresponds to a logic low output.
These bits assign each fan to a particular temperature sensor for localized cooling.
000 = Remote 1 temperature controls PWMx (automatic fan control mode).
001 = Local temperature controls PWMx (automatic fan control mode).
010 = Remote 2 temperature controls PWMx (automatic fan control mode).
011 = PWMx runs full speed (default).
100 = PWMx disabled.
101 = Fastest speed calculated by local and Remote 2 temperature controls PWMx.
110 = Fastest speed calculated by all three temperature channel controls PWMx.
111 = Manual mode. PWM current duty cycle registers (0x30 to 0x32) become writable.
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Power-On Default
0x62
0x62
0x62
ADT7476A