ADT7463 datasheet(9/52 Pages) AD

Numer części	ADT7463

Szczegółowy opis	dB COOL Remote Thermal Controller and Voltage Monitor

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REV. 0

ADT7463

–9–

SERIAL BUS INTERFACE

Control of the ADT7463 is carried out using the serial System

Management bus (SMBus). The ADT7463 is connected to this

bus as a slave device, under the control of a master controller.

The ADT7463 has a 7-bit serial bus address. When the device

is powered up with Pin 13 (PWM3/

Address Enable) high, the

ADT7463 will have a default SMBus address of 0101110 or

0x5C. If more than one ADT7463 is to be used in a system,

then each ADT7463 should be placed in Address Select Mode

by strapping Pin 13 low on power-up. The logic state of Pin 14

then determines the device’s SMBus address.

The device address is sampled and latched on the first valid

SMBus transaction, so any attempted addressing changes made

thereafter will have no immediate effect.

Table I. Address Select Mode

Pin 13 State

Pin 14 State

Address

0Low (10 k

Ω to GND)

0101100 (0x2C)

0High (10 k

Ω pull-up)

0101101 (0x2D)

1Don’t Care

0101110 (0x2E)

(default)

ADT7463

14

13

ADDR_SEL

PWM3/

ADDR_EN

VCC

10k

ADDRESS = 0x2E

Figure 3. Default SMBus Address = 0x2E

ADT7463

14

13

ADDR_SEL

PWM3/

ADDR_EN

10k

ADDRESS = 0x2C

Figure 4. SMBus Address = 0x2C (Pin 14 = 0)

The ability to make hardwired changes to the SMBus slave

address allows the user to avoid conflicts with other devices

sharing the same serial bus, for example, if more than one

ADT7463 is used in a system.

The serial bus protocol operates as follows:

1. The master initiates data transfer by establishing a START

condition, defined as a high to low transition on the serial

data line SDA while the serial clock line SCL remains high.

This indicates that an address/data stream will follow. All

slave peripherals connected to the serial bus respond to the

START condition and shift in the next eight bits, consisting

of a 7-bit address (MSB first) plus a R/

W bit, which deter-

mines the direction of the data transfer, i.e., whether data

will be written to or read from the slave device.

ADT7463

ADDR_SEL

PWM3/

ADDR_EN

ADDRESS = 0x2D

14

13

VCC

10k

Figure 5. SMBus Address = 0x2D (Pin 14 = 1)

ADT7463

14

13

ADDR_SEL

PWM3/

ADDR_EN

VCC

10k

DO NOT LEAVE ADDR_EN

UNCONNECTED! CAN

CAUSE UNPREDICTABLE

ADDRESSES

NC

CARE SHOULD BE TAKEN TO ENSURE THAT PIN 13

(PWM3/

ADDR_EN) IS EITHER TIED HIGH OR LOW. LEAVING PIN 13

FLOATING COULD CAUSE THE ADT7463 TO POWER UP WITH AN

UNEXPECTED ADDRESS.

NOTE THAT IF THE ADT7463 IS PLACED INTO ADDRESS SELECT

MODE, PINS 13 AND 14 CANNOT BE USED AS THE ALTERNATE

FUNCTIONS (PWM3, TACH4/

THERM) ONLY IF THE CORRECT

CIRCUIT IS MUXED IN AT THE CORRECT TIME

Figure 6. Unpredictable SMBus Address if Pin 13

is Unconnected

R/

W

0

SCL

SDA

10

1

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

ACK. BY

ADT7463

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS

BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

19

1

ACK. BY

ADT7463

9

D7

D6

D5

D4

D3

D2

D1

D0

ACK. BY

ADT7463

STOP BY

MASTER

FRAME 3

DATA

BYTE

1

9

SCL (CONTINUED)

SDA (CONTINUED)

Figure 7. Writing a Register Address to the Address Pointer Register, Then Writing Data to the Selected Register

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