EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 72

• Manufacturer Part Number: EVAL-ADT7467EBZ
• Description: BOARD EVALUATION FOR ADT7467
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of EVAL-ADT7467EBZ

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 120°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1.5°C
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7467
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7467
Table 47. Register 0x70—Remote 1 Temperature Offset (Power-On Default = 0x00)
Bit
<7:0>
1
Table 48. Register 0x71—Local Temperature Offset (Power-On Default = 0x00)
Bit
<7:0>
1
Table 49. Register 0x72—Remote 2 Temperature Offset (Power-On Default = 0x00)
Bit
<7:0>
1
Table 50. Register 0x73—Configuration Register 2 (Power-On Default = 0x00)
Bit
<0>
<1>
<2>
<3>
<4>
<5>
<6>
<7>
1
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
R/W
Read/write
R/W
Read/write
Read/write
R/W
1
1
1
Name
AIN1
AIN2
AIN3
AIN4
AVG
ATTN
CONV
SHDN
Description
Allows a twos complement offset value to be automatically added to or subtracted from the local temperature reading. LSB value =
0.5°C.
Description
Allows a twos complement offset value to be 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.
R/W
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Description
Allows a twos complement offset value to be automatically added to or subtracted from the Remote 1 temperature
reading. This is to compensate for any inherent system offsets such as PCB trace resistance. LSB value = 0.5°C.
1
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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
(0x7D). Only relevant in low frequency mode.
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
(0x7D). Only relevant in low frequency mode.
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
(0x7D). Only relevant in low frequency mode.
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
(0x7D). Only relevant in low frequency mode.
AVG = 1, averaging on the temperature and voltage measurements is turned off. This allows
measurements on each channel to be made much faster.
ATTN = 1, the ADT7467 removes the attenuators from the V
used for other functions such as connecting external sensors.
CONV = 1, the ADT7467 is put into a single-channel ADC conversion mode. In this mode, the
ADT7467 can be set 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 the TACH1
minimum high byte register (0x55).
Bits <7:5>, Register 0x55
000
001
010
011
100
101
110
111
SHDN = 1, ADT7467 goes into shutdown mode. All PWM outputs assert low (or high
depending on the state of the INV bit) to switch off all fans. The PWM current duty cycle
registers read 0x00 to indicate that the fans are not being driven.
Reserved
V
V
Reserved
Reserved
Remote 1 temperature
Local temperature
Remote 2 temperature
CCP
CC
(3.3 V)
CCP
input. The V
CCP
input can be