TMP512 datasheet(15/62 Pages) TI2

15 / 62 page

BE2

BE1

nkT

(

n =

eff

1.008

300

(300

)

ADJUST

300

ADJUST

300

1.008

eff

(

Power Register

Current Register

Two-Wire

Interface

Voltage Register

ADC

GND

GPIO

DXP1

DXN1

DXP2

DXN2

ADC

Low-Pass Filter

MUX

DXP3

DXN3

IN+

IN-

Current

Shunt

Load

Filter C

V+

Subregulator

3.3V

Internal

Diode

Temperature

Sensor

ALERT

SDA

SCL

SMBus

Controller

3.3V Supply

TMP512

TMP513

TMP512

TMP513

www.ti.com

SBOS491A

– JUNE 2010 – REVISED MAY 2011

n-FACTOR CORRECTION REGISTER

twos-complement format, yielding an effective data

range from

–128 to +127. The n-factor value may be

The TMP512/13 allow for a different n-factor value to

written to and read from pointer address 16h for

used

for

converting

remote

channel

remote channel 1, pointer address 17h for remote

measurements to temperature. The remote channel

channel 2, and pointer address 18h for remote

uses

sequential

current

excitation

extract

channel 3. The register power-on reset value is 00h,

differential VBE voltage measurement to determine

thus having no effect unless the register is written to.

the temperature of the remote transistor. Equation 1

describes this voltage and temperature.

BUS OVERVIEW

The device that initiates the transfer is called a

(1)

master, and the devices controlled by the master are

slaves. The bus must be controlled by a master

The value n in Equation 1 is a characteristic of the

device that generates the serial clock (SCL), controls

particular transistor used for the remote channel. The

the bus access, and generates START and STOP

power-on reset value for the TMP512/13 is n = 1.008.

conditions.

The value in the n-Factor Correction Register may be

used to adjust the effective n-factor according to

To address a specific device, the master initiates a

Equation 2 and Equation 3.

START condition by pulling the data signal line (SDA)

from a HIGH to a LOW logic level while SCL is HIGH.

All slaves on the bus shift in the slave address byte

(2)

on the rising edge of SCL, with the last bit indicating

whether a read or write operation is intended. During

the ninth clock pulse, the slave being addressed

(3)

responds

the

master

generating

The

n-factor

value

must

stored

Acknowledge and pulling SDA LOW.

Figure 23. Typical Application Circuit

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