ADM1030
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25
Table 17. VALUE AND LIMIT REGISTERS
Address
Read/Write
Description
0x06
Read/Only
Extended Temperature Resolution (see Table 22).
0x08
Read/Write
Fan Speed Reading this register contains the fan speed tach measurement.
0x0A
Read/Only
Local Temperature Value this register contains the 8 MSBs of the local temperature measurement.
0x0B
Read/Only
Remote Temperature Value this register contains the 8 MSBs of the remote temperature reading.
0x0D
Read/Write
Local Temperature Offset See Table 29.
0x0E
Read/Write
Remote Temperature Offset See Table 30.
0x10
Read/Write
Fan Tach High Limit this register contains the limit for the fan tach measurement. Since the tach
circuit counts between pulses, a slow fan will result in a large measured value, so exceeding the limit
by one is the way to detect a slow or stalled fan. (Power-on Default = FFh)
0x14
Read/Write
Local Temperature High Limit (Power-on Default 60rC).
0x15
Read/Write
Local Temperature Low Limit (Power-on Default 0rC).
0x16
Read/Write
Local Temperature Therm Limit (Power-on Default 70rC).
0x18
Read/Write
Remote Temperature High Limit (Power-on Default 80rC).
0x19
Read/Write
Remote Temperature Low Limit (Power-on Default 0rC).
0x1A
Read/Write
Remote Temperature Therm Limit (Power-on Default 100rC).
Table 18. REGISTER 0X00 CONFIGURATION REGISTER 1 POWER-ON DEFAULT 90H
Bit
Name
R/W
Description
0
MONITOR
Read/Write
Setting this bit to a 1 enables monitoring of temperature and enables measurement of
the fan tach signals. (Power-up Default = 0)
1
INT
Enable
Read/Write
Setting this bit to a 1 enables the INT
output. 1 = Enabled 0 = Disabled (Power-up
Default = 0)
2
TACH/AIN
Read/Write
Clearing this bit to 0 selects digital fan speed measurement via the TACH pins. Setting
this bit to 1 configures the TACH pins as analog inputs that can measure the speed of
2-wire fans via a sense resistor. (Power-up Default = 0)
3
PWM Invert
Read/Write
Setting this bit to 1 inverts the PWM signal on the output pin. (Power-up Default = 0).
The power-up default makes the PWM_OUT pin go low for 100% duty cycle (suitable
for driving the fan using a PMOS device). Setting this bit to 1 makes the PWM_OUT
pin high for 100% duty cycle (intended for driving the fan using an NMOS device).
4
Fan Fault Enable
Read/Write
Logic 1 enables FAN_FAULT
pin; Logic 0 disables FAN_FAULT
output. (Power-up
Default = 1.)
65
PWM Mode
Read/Write
These two bits control the behavior of the fan in Auto Fan Speed Control Mode.
00 = Remote Temp controls Fan. (Program PWM duty cycle in Software Mode.)
11 = Fastest Calculated Speed Controls Fan. (Program RPM speed in Software Mode.)
7
Auto/SW Ctrl
Read/Write
Logic 1 selects Automatic Fan Speed Control; Logic 0 selects SW control. (Power-up
Default = 1) When under software control, PWM duty cycle or RPM values may be
programmed for the fan.
Table 19. REGISTER 0X01 CONFIGURATION 2 POWER-ON DEFAULT = 7FH
Bit
Name
R/W
Description
0
PWM 1 En
Read/Write
Enables fan PWM output when this bit is a 1.
1
Unused
Read/Write
Unused
2
TACH 1 En
Read/Write
Enables Tach input when set to 1.
3
Unused
4
Loc Temp En
Read/Write
Enables Interrupts on Local Channel when set to 1.
5
Remote Temp En
Read/Write
Enables Interrupts on Remote Channel when set to 1. Default is normally enabled,
except when a diode fault is detected on power-up.
6
Unused
Read/Write
Unused
7
SW Reset
Read/Write
When set to 1, resets the device. Self-clears. Power-up Default = 0.
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