UCD3138 datasheet(47/89 Pages) TI1

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EXT CAP

AD02

400

Digital

RSHARE

250

3.3 V

ISHARE

ADC12 and

CMP

ESD

250

3. 2 k

ESD

AD13

3.3V

SW2

SW1

SW3

3.3 V

ADC12 and

CMP

UCD3138

www.ti.com

SLUSAP2G – MARCH 2012 – REVISED SEPTEMBER 2016

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Detailed Description

•

PWM bus current sharing

•

Master/Slave current sharing

•

AD02 has a special ESD protection mechanism that prevents the pin from pulling down the current-

share bus if power is missing from the UCD3138

The simplified current sharing circuitry is shown in the drawing below:

Figure 6-16. Simplified Current Sharing Circuitry

CURRENT SHARING MODE

FOR TEST ONLY,

ALWAYS KEEP 00

CS_MODE

EN_SW1

EN_SW2

DPWM

Off or Slave Mode (3-state)

00 (default)

PWM Bus

ACTIVE

Off or Slave Mode (3-state)

Analog Bus or Master

The period and the duty of 8-bit PWM current source and the state of the SW1 and SW2 switches can be

controlled through the current sharing control register (CSCTRL).

6.5.13 Temperature Reference

The temperature reference register (TEMPREF) provides the ADC12 count when ADC12 measures the

internal temperature sensor (channel 14) during the factory trim and calibration.

This information can be used by different periodic temperature compensation routines implemented in the

firmware. But it should not be overwritten by firmware, otherwise this factory written value will be lost.

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