ADT7470 Analog Devices, Inc., ADT7470 Datasheet - Page 30

• Manufacturer Part Number: ADT7470
• Description: Temperature Sensor Hub And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7470
Table 33. Register 0x43. Fan Pulses Per Revolution Register (Power-On Default = 0x55)
Bit Name
<1:0> Fan 1
<3:2> Fan 2
<5:4> Fan 3
<7:6> Fan 4
Exceeding any of the temperature limits shown in Table 34 by 1°C causes the appropriate status bit to be set in the interrupt status registers.
High limits: An interrupt is generated when a value exceeds its high limit (> comparison).
Low limits: An interrupt is generated when a value is equal to or below its low limit (≤ comparison).
Table 34. Register 0x44 to Register 0x57. Temperature Limit Registers
Register Address
0x44
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
0x4D
0x4E
0x4F
0x50
0x51
0x52
0x53
0x54
0x55
0x56
0x57
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
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Description
Sets the number of pulses to be counted when measuring Fan 1 speed.
Can be used to determine fan’s pulses per revolution number for 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’s pulses per revolution number for 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’s pulses per revolution for 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’s
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Description
Temperature 1 Low Limit
Temperature 1 High Limit
Temperature 2 Low Limit
Temperature 2 High Limit
Temperature 3 Low Limit
Temperature 3 High Limit
Temperature 4 Low Limit
Temperature 4 High Limit
Temperature 5 Low Limit
Temperature 5 High Limit
Temperature 6 Low Limit
Temperature 6 High Limit
Temperature 7 Low Limit
Temperature 7 High Limit
Temperature 8 Low Limit
Temperature 8 High Limit
Temperature 9 Low Limit
Temperature 9 High Limit
Temperature 10 Low Limit
Temperature 10 High Limit
Rev. B | Page 30 of 40
Power-On Default
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F
0x81
0x7F