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ADT7490
Table 71. REGISTER 0x5C, REGISTER 0x5D, AND REGISTER 0x5E ? PWM1, PWM2, AND PWM3 CONFIGURATION
REGISTERS (POWER-ON DEFAULT = 0x62)
Bit No.
[2:0]
Mnemonic
SPIN
R/W (Note 1)
R/W
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, then the Interrupt Status Register 2 bit is not set, even if
the fan has not started.
Bit Code Startup Time
000
001
010
011
100
101
110
111
No Startup Timeout
100 ms
250 ms (Default)
400 ms
667 ms
1 sec
2 sec
4 sec
[3]
[4]
[7:5]
ALT
INV
BHVR
(Note 2)
R/W
R/W
R/W
Use alternative behavior setting options in Bits [7:5] below for PWMx by setting this bit to 1.
Default = 0.
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 a 100% duty cycle
corresponds to a logic low output.
These bits assign each fan to a particular temperature sensor for localized cooling. Setting Bit 3
to Logic 1 in this register chooses whether the default of alternative behavior option is selected.
Alternative Behavior Bits (Note 2)
Default Behavior Bits
000 = Remote 1 temperature controls
000 = PECI0 reading controls PWMx
PWMx (automatic fan control mode).
(automatic fan control mode).
001 = Local temperature controls PWMx
001 = PECI1 reading controls PWMx
(automatic fan control mode).
(automatic fan control mode).
010 = Remote 2 temperature controls
010 = PECI2 reading controls PWMx
PWMx (automatic fan control mode).
(automatic fan control mode).
011 = PWMx runs full speed (default).
011 = PECI3 reading controls PWMx
(automatic fan control mode).
100 = PWMx disabled.
100 = Reserved. If selected, fans run at 100%
duty cycle.
101 = Fastest speed calculated by local
101 = Fastest of all four PECI channels. Fastest
and Remote 2 temperature controls PWMx.
speed calculated by all four PECI readings.
110 = Fastest speed calculated by all three
110 = Reserved. If selected, fans run at 100%
temperature channel controls PWMx.
duty cycle.
111 = Manual mode. PWM duty cycle
111 = Fastest speed calculated by all of the
registers (Register 0x30 to Register 0x32)
thermal zones (Local, Remote 1, Remote 2,
become writable.
and PECI temperatures).
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any subsequent attempts to write to this
register fail.
2. When REPLACE mode is selected, (Register 0x36, Bit 4 set to 1) PWM1 is automatically configured for the alternative behavior setting.
Register 0x36, Bits [7:5] should be set to 000 only.
Table 72. TEMPERATURE T RANGE /PWM FREQUENCY REGISTERS
Register Address
0x5F
0x60
0x61
R/W (Note 1)
R/W
R/W
R/W
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 when the Configuration Register 1 (0x40) Lock bit is set. Any further attempts to write to these registers
have no effect.
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