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参数资料
型号： ADT7470ARQZ
厂商： ANALOG DEVICES INC
元件分类： 温度/湿度传感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 7BIT(s), RECTANGULAR, SURFACE MOUNT
封装： ROHS COMPLIANT, MO-137AB, QSOP-16
文件页数： 8/40页
文件大小： 962K
代理商： ADT7470ARQZ
ADT7470
Rev. C | Page 16 of
40
LIMIT AND STATUS REGISTERS
LIMIT VALUES
Associated with each measurement channel on the ADT7470
are high and low limits. These can form the basis of system
status monitoring; a status bit can be set for any out-of-limit
condition and be detected by polling the device. Alternatively,
SMBALERT interrupts can be generated to automatically flag
a service processor or microcontroller for out-of-limit
conditions as they occur.
TEMPERATURE LIMITS
Table 9 lists the 8-bit temperature limits on the ADT7470.
Table 9. Temperature Limit Registers (8-Bit Limits)
Register Address
Description
Default
0x44
Temperature 1 Low Limit
0x81
0x45
Temperature 1 High Limit
0x7F
0x46
Temperature 2 Low Limit
0x81
0x47
Temperature 2 High Limit
0x7F
0x48
Temperature 3 Low Limit
0x81
0x49
Temperature 3 High Limit
0x7F
0x4A
Temperature 4 Low Limit
0x81
0x4B
Temperature 4 High Limit
0x7F
0x4C
Temperature 5 Low Limit
0x81
0x4D
Temperature 5 High Limit
0x7F
0x4E
Temperature 6 Low Limit
0x81
0x4F
Temperature 6 High Limit
0x7F
0x50
Temperature 7 Low Limit
0x81
0x51
Temperature 7 High Limit
0x7F
0x52
Temperature 8 Low Limit
0x81
0x53
Temperature 8 High Limit
0x7F
0x54
Temperature 9 Low Limit
0x81
0x55
Temperature 9 High Limit
0x7F
0x56
Temperature 10 Low Limit
0x81
0x57
Temperature 10 High Limit
0x7F
FAN SPEED LIMITS
The fan tach measurements are 16-bit results. The fan tach
limits are also 16 bits, consisting of two bytes: a high byte and
low byte. On the ADT7470 it is possible to set both high and
low speed fan limits for over speed and under speed or stall con-
ditions. Be aware that, because the fan tach period is actually
being measured, exceeding the limit by 1 indicates a slow or
stalled fan. Likewise, exceeding the high speed limit by 1
generates an over speed condition.
Table 10. Fan Underspeed Limit Registers
Register Address
Description
Default
0x58
Tach 1 Min Low Byte
0xFF
0x59
Tach 1 Min High Byte
0xFF
0x5A
Tach 2 Min Low Byte
0xFF
0x5B
Tach 2 Min High Byte
0xFF
0x5C
Tach 3 Min Low Byte
0xFF
0x5D
Tach 3 Min High Byte
0xFF
0x5E
Tach 4 Min Low Byte
0xFF
0x5F
Tach 4 Min High Byte
0xFF
Table 11. Fan Overspeed Limit Registers
Register Address
Description
Default
0x60
Tach 1 Max Low Byte
0x00
0x61
Tach 1 Max High Byte
0x00
0x62
Tach 2 Max Low Byte
0x00
0x63
Tach 2 Max High Byte
0x00
0x64
Tach 3 Max Low Byte
0x00
0x65
Tach 3 Max High Byte
0x00
0x66
Tach 4 Max Low Byte
0x00
0x67
Tach 4 Max High Byte
0x00
OUT-OF-LIMIT COMPARISONS
Once all limits are programmed, the ADT7470 can be enabled
to begin monitoring. The ADT7470 measures all parameters in
round-robin format and sets the appropriate status bit for out-
of-limit conditions.
Comparisons are done differently depending on whether the
measured value is compared to a high limit or a low limit.
High Limit: > Comparison Performed
Low Limit: ≤ Comparison Performed
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