ADT7475ARQZ ON Semiconductor, ADT7475ARQZ Datasheet - Page 49

• Manufacturer Part Number: ADT7475ARQZ
• Description: IC REMOTE THERMAL CTRLR 16-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7475ARQZ

• 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

1. These registers become read−only when the Configuration Register 1 lock bit is set. Any subsequent attempts to write to these registers fail.
Table 28. Temp T
Table 29. Register 0x05F, Register 0x60, and Register 0x61 — Temp T
(Power−On Default = 0xC4)
Bit No.
[2:0]
[7:4]
Register Address
[3]
0x5F
0x60
0x61
Mnemonic
RANGE
FREQ
HF/LF
RANGE
/PWM Frequency Registers
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Remote 1 T
Local T
Remote 2 T
These bits control the PWMx frequency.
HF/LF =1, enables high frequency PWM output for 4−wire fans. Once enabled, 3−wire fan
specific settings have no effect (this means, pulse stretching).
These bits determine the PWM duty cycle vs. the temperature slope for automatic fan control.
000 = 11.0 Hz
001 = 14.7 Hz
010 = 22.1 Hz
011 = 29.4 Hz
100 = 35.3 Hz (default)
101 = 44.1 Hz
110 = 58.8 Hz
111 = 88.2 Hz
0000 = 2°C
0001 = 2.5°C
0010 = 3.33°C
0011 = 4°C
0100 = 5°C
0101 = 6.67°C
0110 = 8°C
0111 = 10°C
1000 = 13.33°C
1001 = 16°C
1010 = 20°C
1011 = 26.67°C
1100 = 32°C (default)
1101 = 40°C
1110 = 53.33°C
1111 = 80°C
RANGE
RANGE
RANGE
/PWM2 frequency.
http://onsemi.com
/PWM1 frequency.
/PWM3 frequency.
(Note 1)
Description
49
Description
RANGE
/PWM Frequency Registers
Power−On Default
0xC4
0xC4
0xC4