参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 75/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
Table 44. Local Temperature Offset
Register Address
0x71
<7:0>
R/W 1
Read/write
Read/write
Description
Local temperature offset.
Allows a twos complement offset value to be
Power-On Default
0x00
automatically added to or subtracted from the local
temperature reading. LSB value = 0.5°C.
1
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have no effect.
Table 45. Remote 2 Temperature Offset
Register Address
0x72
<7:0>
R/W 1
Read/write
Read/write
Description
Remote 2 temperature offset.
Allows a twos complement offset value to be
Power-On Default
0x00
automatically added to or subtracted from the
Remote 2 temperature reading. This is to
compensate for any inherent system offsets such as
PCB trace resistance. LSB value = 0.5°C.
1
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have no effect.
Table 46. Register 0x73—Configuration Register 2 (Power-On Default = 0x00)
Bit
0
Name
AIN1
R/W 1
Read/write
Description
AIN1 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN1 = 1, Pin 6 is reconfigured to measure the speed of 2-wire fans using an external sensing
resistor and coupling capacitor. AIN voltage threshold is set via Configuration Register 4 (Reg.
0x7D). Only relevant in low frequency mode.
1
AIN2
Read/write
AIN2 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN2 = 1, Pin 7 is reconfigured to measure the speed of 2-wire fans using an external sensing
resistor and coupling capacitor. AIN voltage threshold is set via Configuration Register 4 (Reg.
0x7D). Only relevant in low frequency mode.
2
AIN3
Read/write
AIN3 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN3 = 1, Pin 4 is reconfigured to measure the speed of 2-wire fans using an external sensing
resistor and coupling capacitor. AIN voltage threshold is set via Configuration Register 4 (Reg.
0x7D). Only relevant in low frequency mode.
3
AIN4
Read/write
AIN4 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN4 = 1, Pin 9 is reconfigured to measure the speed of 2-wire fans using an external sensing
resistor and coupling capacitor. AIN voltage threshold is set via Configuration Register 4 (Reg.
0x7D). Only relevant in low frequency mode.
4
AVG
Read/write
AVG = 1, averaging on the temperature and voltage measurements is turned off. This allows
measurements on each channel to be made much faster.
5
ATTN
Read/write
ATTN = 1, the ADT7468 removes the attenuators from the 2.5 V, V CCP , 5 V, and 12 V inputs.
These inputs can be used for other functions such as connecting up external sensors. It is
possible to remove attenuators from individual channels using Bits <7:4> of Configuration
Register 4 (0x7D).
6
CONV
Read/write
CONV = 1, the ADT7468 is put into a single-channel ADC conversion mode. In this mode, the
ADT7468 can be made to read continuously from one input only, for example, Remote 1
temperature. The appropriate ADC channel is selected by writing to Bits <7:5> of TACH1
minimum high byte register (0x55).
Bits <7:5> Reg. 0x55
000 2.5 V
001 V CCP
010 V CC (3.3 V)
011 5 V
100 12 V
101 Remote 1 temperature
110 Local temperature
111 Remote 2 temperature
7
SHDN
Read/write
SHDN = 1, ADT7468 goes into shutdown mode. All PWM outputs assert low (or high
depending on state of INV bit) to switch off all fans. The PWM current duty cycle registers
read 0x00 to indicate that the fans are not being driven.
1
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have no effect.
Rev. 3 | Page 75 of 81 | www.onsemi.com
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