ADT7475ARQZ(2011) 查看數據表（PDF） - ON Semiconductor

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ADT7475ARQZ
(Rev.:2011)

dbCOOL™ Remote Thermal Monitor and Fan Controller

ON Semiconductor 

ADT7475

This effectively gives a reading 16 times faster (711 ms), but

the reading may be noisier.

Bypass Voltage Input Attenuator

Setting Bit 5 of Configuration Register 2 (0x73) removes

the attenuation circuitry from the VCCP input. This allows

the user to directly connect external sensors or to rescale the

analog voltage measurement inputs for other applications.

The input range of the ADC without the attenuators is 0 V

to 2.25 V.

Single−Channel ADC Conversion

Setting Bit 6 of Configuration Register 2 (0x73) places the

ADT7475 into single−channel ADC conversion mode. In

this mode, the ADT7475 can be made to read a single

voltage channel only. If the internal ADT7475 clock is used,

the selected input is read every 711 ms. The appropriate ADC

channel is selected by writing to Bits [7:5] of the TACH1

minimum high byte register (0x55).

Table 1. Single−Channel ADC Conversion

Register 0x55, Bits [7:5]

Channel Selected

001

VCCP

010

VCC

101

Remote 1 Temperature

110

Local Temperature

111

Remote 2 Temperature

Configuration Register 2 (0x73)

Bit 4 = 1; averaging off.

Bit 5 = 1; bypass input attenuators.

Bit 6 = 1; single−channel convert mode.

TACH1 Minimum High Byte (0x55)

Bits [7:5] select the ADC channel for single−channel

convert mode.

Table 2. 10−Bit ADC Output Code vs. VIN

ADC Output

VCC (3.3 VIN) (Note 1)

<0.0042

VCCP

<0.00293

Decimal

0

0.0042 to 0.0085

0.0293 to 0.0058

1

0.0085 to 0.0128

0.0058 to 0.0087

2

0.0128 to 0.0171

0.0087 to 0.0117

3

0.0171 to 0.0214

0.0117 to 0.0146

4

0.0214 to 0.0257

0.0146 to 0.0175

5

0.0257 to 0.0300

0.0175 to 0.0205

6

0.0300 to 0.0343

0.0205 to 0.0234

7

0.0343 to 0.0386

0.0234 to 0.0263

8

−

−

−

1.100 to 1.1042

0.7500 to 0.7529

256 (1/4 scale)

−

−

−

2.200 to 2.2042

1.5000 to 1.5029

512 (1/2 scale)

−

−

−

3.300 to 3.3042

2.2500 to 2.2529

768 (3/4 scale)

−

−

−

4.3527 to 4.3570

2.9677 to 2.9707

1013

4.3570 to 4.3613

2.9707 to 2.9736

1014

4.3613 to 4.3656

2.9736 to 2.9765

1015

4.3656 to 4.3699

2.9765 to 2.9794

1016

4.3699 to 4.3742

2.9794 to 2.9824

1017

4.3742 to 4.3785

2.9824 to 2.9853

1018

4.3785 to 4.3828

2.9853 to 2.9882

1019

4.3828 to 4.3871

2.9882 to 2.9912

1020

4.3871 to 4.3914

2.9912 to 2.9941

1021

4.3914 to 4.3957

2.9941 to 2.9970

1022

>4.3957

>2.9970

1023

1. The VCC output codes listed assume that VCC is 3.3 V and that VCC should never exceed 3.6 V.

Binary (10 Bits)

00000000 00

00000000 01

00000000 10

00000000 11

00000001 00

00000001 01

00000001 10

00000001 11

00000010 00

−

01000000 00

−

10000000 00

−

11000000 00

−

11111101 01

11111101 10

11111101 11

11111110 00

11111110 01

11111110 10

11111110 11

11111111 00

11111111 01

11111111 10

11111111 11

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