Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - temperature management Internal, External 2-wire serial, I²C/SMBus SOIC 14

Power Register

Current Register

Two-Wire

Interface

Voltage Register

ADC

GPIO

GND

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

V = V -

SHUNT IN+

IN-

Typically < 50mV

V =

BUS

GND-V

IN-

Range of 0V to 26V

Typical Application: 12V

TMP512

TMP513

SBOS491A –JUNE 2010– REVISED MAY 2011

www.ti.com

Figure 29. TMP512/13 Configured for Shunt and Bus Voltage Measurement

All current and power calculations are performed in

The Conversion Ready bit and the Conversion Ready

the background and do not contribute to conversion

Temperature bit clear when reading the Status

time; conversion times shown in the Electrical

Characteristics table can be used to determine the

actual conversion time.

POWER MEASUREMENT

Power-Down mode reduces the quiescent current

Current and bus voltage are converted at different

and turns off current into the TMP512/13 inputs,

points in time, depending on the resolution and

avoiding any supply drain. Full recovery from

averaging mode settings. For instance, when

Power-Down requires 40μs. ADC Off mode (set by

configured for 12-bit and 128 sample averaging, up to

Configuration Register 1, MODE bits) stops all

81ms in time between sampling these two values is

conversions.

possible. Again, these calculations are performed in

Although the TMP512/13 can be read at any time,

the background and do not add to the overall

and the data from the last conversion remain

conversion time.

available, the Conversion Ready bit and the

Conversion Ready Temperature bit (Status Register,

PGA FUNCTION

CVR and CRT) are provided to help co-ordinate

If larger full-scale shunt voltages are desired, the

one-shot or triggered conversions. The Conversion

TMP512/13 provide a PGA function that increases

Ready bit and the Conversion Ready Temperature bit

the full-scale range up to 2, 4, or 8 times (320mV).

are set after all conversions, averaging, and

Additionally, the bus voltage measurement has two

multiplication operations are complete.

full-scale ranges: 16V or 32V.