ADT7470ARQZ-REEL Analog Devices Inc, ADT7470ARQZ-REEL Datasheet - Page 33

• Manufacturer Part Number: ADT7470ARQZ-REEL
• Description: IC,Motor Controller,SSOP,16PIN
• Manufacturer: Analog Devices Inc

Specifications of ADT7470ARQZ-REEL

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Control, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Type: I²C™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADT7470EBZ - BOARD EVALUATION FOR ADT7470
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 36. Register 0x58 to Register 0x67. Fan Tachometer Limit Registers.
Register Address
0x58
0x59
0x5A
0x5B
0x5C
0x5D
0x5E
0x5F
0x60
0x61
0x62
0x63
0x64
0x65
0x66
0x67
Exceeding any of the tach min limit registers shown in Table 36 by 1 indicates that the fan is running too slowly or has stalled.
The appropriate status bit is set in Interrupt Status Register 2 to indicate the fan failure.
Exceeding any of the tach max limit registers by 1 indicates that the fan is too fast. The appropriate status bit is set in Interrupt Status
Register 2 to indicate the fan failure.
Table 37. Register 0x68. PWM1/PWM2 Configuration Register (Power-On Default = 0x00).
Bit Name
[0]
[1]
[2]
[3]
[4] INV2
[5] INV1
[6] BHVR2
[7] BHVR1
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
N/A
N/A
N/A
N/A
Read/Write
Read/Write
Read/Write
Read/Write
Description
Tach 1 min low byte
Tach 1 min high byte
Tach 2 min low byte
Tach 2 min high byte
Tach 3 min low byte
Tach 3 min high byte
Tach 4 min low byte
Tach 4 min high byte
Tach 1 max low byte
Tach 1 max high byte
Tach 2 max low byte
Tach 2 max high byte
Tach 3 max low byte
Tach 3 max high byte
Tach 4 max low byte
Tach 4 max high byte
Description
Set to 0 (default).
Set to 0 (default).
Set to 0 (default).
Set to 0 (default).
Setting this bit to 1 inverts the PWM2 output. Default = 0.
Setting this bit to 1 inverts the PWM1 output. Default = 0.
This bit assigns fan behavior for PWM2 output.
0 = manual fan control mode (PWM duty cycle controlled in software).
1 = automatic fan control mode
This bit assigns fan behavior for PWM1 output.
0 = manual fan control mode (PWM duty cycle controlled in software).
1 = automatic fan control mode.
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Power-On Default
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
ADT7470