ADT7473ARQZ-RL7 ON Semiconductor, ADT7473ARQZ-RL7 Datasheet - Page 61

• Manufacturer Part Number: ADT7473ARQZ-RL7
• Description: IC REMOTE THERMAL CTLR 16QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7473ARQZ-RL7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (3-Wire, 4-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 27. Register 0x42 — Interrupt Status Register 2 (Power−On Default = 0x00)
Table 28. Voltage Limit Registers
1. Setting the Configuration Register 1 lock bit has no effect on these registers.
2. High limits: an interrupt is generated when a value exceeds its high limit (> comparison). Low limits: an interrupt is generated when a value
Table 29. Temperature Limit Registers
1. Exceeding any of these temperature limits by 1°C causes the appropriate status bit to be set in the interrupt status register. Setting the
2. High limits: an interrupt is generated when a value exceeds its high limit (> comparison). Low limits: an interrupt is generated when a value
Bit No.
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
is equal to or below its low limit (≤ comparison).
Configuration Register 1 lock bit has no effect on these registers.
is equal to or below its low limit (≤ comparison).
Register Address
Register Address
0x46
0x47
0x48
0x49
0x4E
0x4F
0x50
0x51
0x52
0x53
Limit Latch
Mnemonic
THERM
FAN1
FAN2
FAN3
RES
OVT
F4P
D1
D2
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
(Note 1)
Reserved on the ADT7473.
On the ADT7473−1, THERM Limit Latch = 1 indicates Remote Channel 2 latch. This is a
THERM limit condition.
OVT = 1 indicates one of the THERM overtemperature limits is exceeded. This bit is cleared
on a read of the status register when the temperature drops below THERM – T
FAN1 = 1 indicates Fan 1 has dropped below minimum speed or has stalled. This bit is not
set when the PWM1 output is off.
FAN2 = 1 indicates Fan 2 has dropped below minimum speed or has stalled. This bit is not
set when the PWM2 output is off.
FAN3 = 1 indicates Fan 3 has dropped below minimum speed or has stalled. This bit is not
set when the PWM3 output is off.
F4P = 1 indicates Fan 4 has dropped below minimum speed or has stalled. This bit is not set
when the PWM3 output is off.
When Pin 9 is programmed as a GPIO output, writing to this bit determines the logic output of
the GPIO.
If Pin 9 is configured as the THERM timer input for THERM monitoring, then this bit is set
when the THERM assertion time exceeds the limit programmed in the THERM timer limit
register (Reg. 0x7A).
D1 = 1 indicates either an open or short circuit on the Thermal Diode 1 inputs.
D2 = 1 indicates either an open or short circuit on the Thermal Diode 2 inputs.
(Note 1)
Remote 1 temperature low limit.
Remote 1 temperature high limit.
Local temperature low limit.
Local temperature high limit.
Remote 2 temperature low limit.
Remote 2 temperature high limit.
V
V
V
V
CCP
CCP
CC
CC
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low limit.
high limit.
low limit.
high limit.
Description (Note 2)
61
Description (Note 2)
Description
Power−On Default
Power−On Default
0xFF
0xFF
0x00
0x00
HYST
0xFF
0xFF
0xFF
0x01
0x01
0x01
.