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REV. A
46
ADM1027
Table XV. Fan Tachometer Limit Registers
Register Address
R/W
Description
Power-On Default
0x54
Read/Write
TACH 1 Minimum Low Byte
0xFF
0x55
Read/Write
TACH 1 Minimum High Byte
0xFF
0x56
Read/Write
TACH 2 Minimum Low Byte
0xFF
0x57
Read/Write
TACH 2 Minimum High Byte
0xFF
0x58
Read/Write
TACH 3 Minimum Low Byte
0xFF
0x59
Read/Write
TACH 3 Minimum High Byte
0xFF
0x5A
Read/Write
TACH 4 Minimum Low Byte
0xFF
0x5B
Read/Write
TACH 4 Minimum High Byte
0xFF
Exceeding any of the TACH limit registers by 1 indicates that the fan is running too slowly or has stalled. The appropriate status bit
will be set in Interrupt Status Register 2 to indicate the fan failure. Setting the Configuration Register 1 lock bit has no effect on
these registers.
Table XVI. PWM Configuration Registers
Register Address
R/W
Description
Power-On Default
0x5C
Read/Write
PWM1 Configuration
0x62
0x5D
Read/Write
PWM2 Configuration
0x62
0x5E
Read/Write
PWM3 Configuration
0x62
Bit
Name
Read/Write
Description
<2:0>
SPIN
Read/Write
These bits control the startup timeout for PWMx. The PWM output stays high until two
(Fan Startup
valid TACH rising edges are seen from the fan. If there is not a valid TACH signal during
Timeout)
the fan TACH measurement directly after the fan startup timeout period, then the TACH
measurement will read 0xFFFF and Status Register 2 will reflect the fan fault. If the
TACH minimum high and low byte contains 0xFFFF or 0x0000, then the Status Register
2 bit will not be set, even if the fan has not started.
000 = No startup timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
101 = 1 sec
110 = 2 sec
111 = 4 sec
Note: Do not program 100.
<3>
Reserved   Read-Only
Reserved for future use.
<4>
INV
Read/Write
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.
<7:5>
BHVR
Read/Write
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 temperatures controls PWMx.
111 = Manual mode. PWM duty cycle registers (Reg. 0x30 to 0x32) become writable.
These registers become read-only when the configuration register 1 lock bit is set to 1. Any subsequent attempts to write to these
registers will fail.
Rev. 3 | Page 46 of 56 | www.onsemi.com
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