ADT7473ARQZ-1 ON Semiconductor, ADT7473ARQZ-1 Datasheet - Page 68

• Manufacturer Part Number: ADT7473ARQZ-1
• Description: IC THERM MON FAN CTRLR 16-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7473ARQZ-1

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 45. Local Temperature Offset Register (0x71)
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
Table 46. Remote 2 Temperature Offset Register (0x72)
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
Table 47. Register 0x73 — Configuration Register 2 (Power−On Default = 0x00)
1. This register becomes read−only when the Configuration Register 1lock bit is set to 1. Any further attempts to write to this register have
Bit No.
Register Address
Register Address
no effect.
no effect.
no effect.
0
1
2
3
4
5
6
7
[7:0]
[7:0]
FanPresDT
Fan1Detect
Fan2Detect
Fan3Detect
Mnemonic
Shutdown
CONV
ATTN
AVG
R/W (Note 1)
Read−only
Read−only
Read−only
R/W (Note 1)
R/W (Note 1)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits [7:5], Register 0x55
000
001
010
011
100
101
110
111
When FanPresenceDT = 1, the state of Bits [3:1] of Register 0x73 reflects the presence of a
4−wire fan on the appropriate TACH channel.
Fan1 Detect = 1 indicates a 4−wire fan is connected to the PWM1 input.
Fan1 Detect = 1 indicates a 4−wire fan is connected to the PWM2 input.
Fan1 Detect = 1 indicates a 4−wire fan is connected to the PWM3 input.
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 ADT7473/ADT7473−1 removes the attenuators from the V
V
CONV = 1, the ADT7473/ADT7473−1 is put into a single−channel ADC conversion mode. In
this mode, the ADT7473/ADT7473−1 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).
SHDN = 1, ADT7473/ADT7473−1 goes into shutdown mode. All PWM outputs assert low or
high, depending on the state of the INV bit, to switch off all fans.
CCP
Allows a twos complement offset value to be automatically
added to or subtracted from the local temperature reading.
LSB value = 0.5°C.
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.
input can be used for other functions such as connecting up external sensors.
Reserved
V
V
Reserved
Reserved
Remote 1 temperature
Local temperature
Remote 2 temperature
CCP
CC
http://onsemi.com
(3.3V)
68
Description
Description
Description
Power−On Default
Power−On Default
CCP
input. The
0x00
0x00