ADT7475ARQZ ON Semiconductor, ADT7475ARQZ Datasheet - Page 56

• 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 to 1. Any subsequent attempts to write to these registers fail.
Table 49. Register 0x7B — TACH Pulses per Revolution Register (Power−On Default = 0x55)
Table 50. Register 0x7C — Configuration Register 5 (Power−On Default = 0x01)
Bit No.
Bit No.
[1:0]
[3:2]
[5:4]
[7:6]
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
TempOffset
R1 THERM
R2 THERM
Mnemonic
Mnemonic
COMPL
THERM
GPIOD
GPIOP
TWOS
FAN1
FAN2
FAN3
FAN4
Local
RES
(Note 1)
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
Sets the number of pulses to be counted when measuring Fan 1 speed. Can be used to
determine fan pulses per revolution for an unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Sets the number of pulses to be counted when measuring Fan 2 speed. Can be used to
determine fan pulses per revolution for an unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Sets the number of pulses to be counted when measuring Fan 3 speed. Can be used to
determine fan pulses per revolution for an unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Sets the number of pulses to be counted when measuring Fan 4 speed. Can be used to
determine fan pulses per revolution for an unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Twos complement = 1, sets the temperature range to twos complement temperature range.
Twos complement = 0, changes the temperature range to Offset 64. When this bit is changed,
the ADT7475 interprets all relevant temperature register values as defined by this bit.
TempOffset = 0, sets offset range to −63°C to +64°C with 0.5°C resolution.
TempOffset = 1, sets offset range to −63°C to +127°C with 1°C resolution.
These settings apply to the 0x70, 0x71, and 0x72 registers (Remote 1, local, and Remote 2
temperature offset registers).
GPIO direction. When the GPIO function is enabled, this determines whether the GPIO is an
input (0) or an output (1).
GPIO polarity. When the GPIO function is enabled and is programmed as an output, this bit
determines whether the GPIO is active low (0) or high (1).
Reserved.
R1 THERM = 0, THERM temperature limit functionality is enabled for the Remote 1
temperature channel.
THERM can also be disabled on any channel by the following:
Local THERM = 0, THERM temperature limit functionality enabled for local temperature
channel.
THERM can also be disabled on any channel by the following:
R2 THERM = 0, THERM temperature limit functionality enabled for Remote 2 temperature
channel.
THERM can also be disabled on any channel by the following:
In offset 64 mode, writing −64°C to the appropriate THERM temperature limit.
In twos complement mode, writing −128°C to the appropriate THERM temperature limit.
In Offset 64 mode, writing −64°C to the appropriate THERM temperature limit.
In twos complement mode, writing −128°C to the appropriate THERM temperature limit.
In offset 64 mode, writing 64°C to the appropriate THERM temperature limit.
In twos complement mode, writing 128°C to the appropriate THERM temperature limit.
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