ADT7466 查看數據表（PDF） - ON Semiconductor

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ADT7466

dBCool® Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

ADT7466

Table 8. Single-Channel ADC Conversions

Bits 2:0, Reg. 0x03

000

001

010

Channel Selected

AIN1

AIN2

VCC

REFERENCE VOLTAGE OUTPUT

The ADT7466 has a reference voltage of 2.25 V, which is

available on Pin 13 of the device. It can be used for scaling and

offsetting the analog inputs to give different voltage ranges. It

can also be used as an excitation voltage for a thermistor when

the analog inputs are configured as thermistor inputs. See the

Temperature Measurement section for more details.

CONFIGURATION OF PIN 11 AND PIN 12

Pin 11 and Pin 12 can be used for analog inputs, thermistor

inputs, or connecting a second remote thermal diode. The

ADT7466 is configured for thermistor connection by default.

The device is configured for the different modes by setting the

appropriate bits in the configuration registers. Bits 6:7 of

Configuration Register 3 (0x02) configure the device for either

analog inputs or thermistor inputs. Bit 7 of Configuration

Register 2 (0x01) configures Pin 11 and Pin 12 for the

connection of a second thermal diode. Bits 2:3 of Interrupt

Status Register 2 (0x11) indicate either an open or short circuit

on Thermal Diode 1 and Diode 2 inputs. Bits 4:5 of Interrupt

Status Register 2 (0x11) indicate either an open or short circuit

on TH1 and TH2 inputs. It is advisable to mask interrupts on

diode open/short alerts when in thermistor monitoring mode

and to mask interrupts on thermistor open/short alerts when in

REM2 mode.

Table 9. A-to-D Output Code vs. VIN

VCC 3.3 V

VCC 5 V

<0.0172

<0.026

0.017–0.034

0.026–0.052

0.034–0.052

0.052–0.078

0.052–0.069

0.078–0.104

1.110–1.127

1.667–1.693

2.220–2.237

3.333–3.359

3.3–3.347

5–5.026

4.371–4.388

6.563–6.589

4.388–4.405

6.589–6.615

4.405–4.423

6.615–6.641

>4.423

>6.634

AIN

<0.0088

0.0088–0.0176

0.0176–0.0264

0.0264–0.0352

0.563–0.572

1.126–1.135

1.689–1.698

2.218–2.226

2.226–2.235

2.235–2.244

>2.244

Decimal

0

1

2

3

64 (¼ scale)

128 (½ scale)

192 (¾ scale)

252

253

254

255

Binary

00000000

00000001

00000010

00000011

01000000

10000000

11000000

11111100

11111101

11111110

11111111

Table 10. Mode Configuration Summary

Mode

Configuration

Register Settings

Thermistor Mode

TH1

TH2

AIN Mode

Register 0x02

Bit 7 = 1

Register 0x02

Bit 6 = 1

AIN1

AIN2

Remote 2 Diode Mode

Register 0x 02

Bit 7 = 0

Register 0x02

Bit 6 = 0

Register 0x01

Bit 7 = 1

1 OOL = Out of limit. NC = No connection.

Limits

Low: Reg 0x14

High: Reg 0x15

Low: Reg 0x16

High: Reg 0x17

Low: Reg 0x14

High: Reg 0x15

Low: Reg 0x16

High: Reg 0x17

Low: Reg 0x14

High: Reg 0x15

Alerts1

OOL: Reg. 0x10, Bit 6

NC: Reg. 0x11, Bit 4

OOL: Reg. 0x10, Bit 5

NC: Reg. 0x11, Bit 5

OOL: Reg. 0x10, Bit 6

Description

Default mode. Mask interrupts on diode NC.

(Set Bits 2:3 of Reg. 0x13.)

Ensure that AFC is not on. (Clear Bits 0:1 of

AFC Configuration Register 1, 0x05.)

OOL: Reg. 0x10, Bit 5

OOL: Reg. 0x10, Bit 6

NC: Reg. 0x11, Bit 3

Mask interrupts on thermistor NC. (Set

Bits 4:5 of Reg. 0x13) and AIN2 (Bit 5 of

Reg. 0x12.)

Rev. 3 | Page 16 of 48 | www.onsemi.com

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