ADT7470ARQZ-REEL Analog Devices Inc, ADT7470ARQZ-REEL Datasheet - Page 36

• 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

ADT7470
Table 44. Register 0x74. Configuration Register 2 (Power-On Default = 0x00).
Bit Name
[7] SHDN
[6:4] FREQ
[3] T4_dis
[2] T3_dis
[1] T2_dis
[0] T1_dis
Table 45. Register 0x78. Max TMP05 Temperature (Power-On Default = 0x00).
Bit Name
[7:0] TMP05_MAX
Table 46. Register 0x7C. TMP05 Zone Select 1 (Power-On Default = 0x00).
Bit Name
[7:4] zone_fan1[3:0]
[3:0] zone_fan2[3:0]
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Description
Shutdown/low current mode.
These bits control PWM1–PWM4 frequency when the fan drive is configured as a low
frequency drive.
Register 0x74[6:4]
000
001
010
011
100
101
110
111
Writing a 1 disables Tach 4 measurements.
Writing a 1 disables Tach 3 measurements.
Writing a 1 disables Tach 2 measurements.
Writing a 1 disables Tach 1 measurements.
Description
This register indicates the maximum of all TMP05 temperatures.
Description
These bits determine which temperature zone controls Fan 1.
zone_fan1[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
These bits determine which temperature zone controls Fan 2.
zone_fan2[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
Rev. C | Page 36 of 40
Register 0x40[6] = 1
11.0 Hz
14.7 Hz
22.1 Hz
29.4 Hz
35.3 Hz
44.1 Hz
58.8 Hz
88.2 Hz
Description
max_temperature from Register 0x78 controls Fan 1.
Temperature 1 from Register 0x20 controls Fan 1.
Temperature 2 from Register 0x21 controls Fan 1.
Temperature 3 from Register 0x22 controls Fan 1.
Temperature 4 from Register 0x23 controls Fan 1.
Temperature 5 from Register 0x24 controls Fan 1.
Temperature 6 from Register 0x25 controls Fan 1.
Temperature 7 from Register 0x26 controls Fan 1.
Temperature 8 from Register 0x27 controls Fan 1.
Temperature 9 from Register 0x28 controls Fan 1.
Temperature 10 from Register 0x29 controls Fan 1.
Description
max_temperature from Register 0x78 controls Fan 2.
Temperature 1 from Register 0x20 controls Fan 2.
Temperature 2 from Register 0x21 controls Fan 2.
Temperature 3 from Register 0x22 controls Fan 2.
Temperature 4 from Register 0x23 controls Fan 2.
Temperature 5 from Register 0x24 controls Fan 2.
Temperature 6 from Register 0x25 controls Fan 2.
Temperature 7 from Register 0x26 controls Fan 2.
Temperature 8 from Register 0x27 controls Fan 2.
Temperature 9 from Register 0x28 controls Fan 2.
Temperature 10 from Register 0x29 controls Fan 2.
Register 0x40[6] = 0
1.4 kHz
22.5 kHz
22.5 kHz
22.5 kHz
22.5 kHz
22.5 kHz
22.5 kHz
22.5 kHz