ADT7467
Table 59. REGISTER 0X5C, REGISTER 0X5D, AND REGISTER 0X5E ? PWM1, PWM2, AND PWM3
CONFIGURATION REGISTERS (POWER-ON DEFAULT = 0X82)
Bit
<2:0>
<3>
<4>
<7:5>
Name
SPIN
SLOW
INV
BHVR
R/W (Note 1)
Read/Write
Read/Write
Read/Write
Read/Write
Description
These bits control the start-up 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 immediately after the fan start-up timeout period, the TACH measurement
reads 0xFFFF and Status Register 2 reflects the fan fault. If the TACH minimum high and low
bytes contain 0xFFFF or 0x0000, the Status Register 2 bit is not set, even if the fan has not
started.
000 = No start-up timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
100 = 667 ms
101 = 1 sec
110 = 2 sec
111 = 4 sec
SLOW = 1 makes the ramp rates for acoustic enhancement four times longer.
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 that 100% duty cycle corres-
ponds 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 at full speed.
100 = PWMx disabled (default).
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 duty cycle registers (0x30 to 0x32) become writable.
1. These registers become read-only registers when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to
these registers fail.
Table 60. T RANGE /PWM FREQUENCY REGISTERS
Register Address
0x5F
0x60
0x61
R/W (Note 1)
Read/Write
Read/Write
Read/Write
Description
Remote 1 T RANGE /PWM1 Frequency
Local T RANGE /PWM2 Frequency
Remote 2 T RANGE /PWM3 Frequency
Power-On Default
0xC4
0xC4
0xC4
1. These registers become read-only registers when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to
these registers fail.
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