ADT7470ARQZ Analog Devices Inc, ADT7470ARQZ Datasheet - Page 34

• Manufacturer Part Number: ADT7470ARQZ
• Description: IC SENSOR TEMP FAN CTRLR 16QSOP
• Manufacturer: Analog Devices Inc

Specifications of ADT7470ARQZ

• 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
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 12%
• Supply Current: 500µA
• Supply Voltage Range: 3V To 5.5V
• Sensor Case Style: QSOP
• No. Of Pins: 16
• Msl: MSL 3 - 168 Hours
• Termination Type: SMD
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Accuracy %: 12%
• 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, Lead free / RoHS Compliant

ADT7470
Table 38. Register 0x69. PWM3/PWM4 Configuration Register (Power-On Default = 0x00).
Bit Name
[0]
[1]
[2]
[3]
[4] INV4
[5] INV3
[6] BHVR4
[7] BHVR3
Table 39. Register 0x6A to Register 0x6D. PWM
Register Address
0x6A
0x6B
0x6C
0x6D
Table 40. PWM
Bit Name
[7:0] PWM Duty Cycle
Table 41. Register 0x6E to Register 0x71. T
Register Address
0x6E
0x6F
0x70
0x71
Table 41 shows the T
minimum speed (PWM
MIN
Duty Cycle Registers Detailed Description
MIN
MIN
registers for each thermal zone. When the temperature measured exceeds T
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
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
). They increase to maximum speed (PWM
MIN
Description
Set to 0 (default).
Set to 0 (default).
Set to 0 (default).
Set to 0 (default).
Setting this bit to 1 inverts the PWM4 output. Default = 0
Setting this bit to 1 inverts the PWM3 output. Default = 0
This bit assigns fan behavior for PWM4 output.
0 = manual fan control mode (PWM duty cycle controlled in software).
1 = (automatic fan control mode.
This bit assigns fan behavior for PWM3 output.
0 = manual fan control mode (PWM duty cycle controlled in software).
1 = automatic fan control mode.
Description
PWM1 min duty cycle.
PWM2 min duty cycle.
PWM3 min duty cycle.
PWM4 min duty cycle.
Description
These bits define the PWNMIN duty cycle for PWMx (x = 1 to 4).
0x00 = 0% duty cycle (fan off ).
0x40 = 25% duty cycle.
0x80 = 50% duty cycle.
0xFF = 100% PMW max duty cycle (full fan speed).
Description
Temperature 1 T
Temperature 2 T
Temperature 3 T
Temperature 4 T
Registers (Power-On Default = 0x5A (90°C)).
MIN
Duty Cycle Registers (Power-On Default = 0x80 (50% Duty Cycle).
Rev. C | Page 34 of 40
MIN
MIN
MIN
MIN
.
.
.
.
MAX
) at T
MIN
+ 20°C.
MIN
, the appropriate fan runs at