UCD3138128 datasheet(40/80 Pages) TI

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ADC

Channels

S/H

12-bit SAR

ADC

12-bit SAR

ADC

ADC12 Block

ADC12

Control

ADC Channel

ADC

Averaging

Digital

Comparators

DPWM

Modules

ADC12 Registers

Analog

Comparators

ADC External Trigger (from pin)

UCD3138128, UCD3138A64

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

www.ti.com

Figure 26. ADC12 Control Block Diagram

9.3.10 Miscellaneous Analog

The Miscellaneous Analog Control (MAC) Registers are a catch-all of registers that control and monitor a wide

variety of functions. These functions include device supervisory features such as Brown-Out and power saving

configuration, general purpose input/output configuration and interfacing, internal temperature sensor control and

current sharing control.

The MAC module also provides trim signals to the oscillator and AFE blocks. These controls are usually used at

the time of trimming at manufacturing; therefore this document will not cover these trim controls.

9.3.11 Brownout

Brownout function is used to determine if the device supply voltage is lower than a threshold voltage, a condition

that may be considered unsafe for proper operation of the device.

The brownout threshold is higher than the reset threshold voltage; therefore, when the supply voltage is lower

than brownout threshold, it still does not necessarily trigger a device reset.

The brownout interrupt flag can be polled or alternatively can trigger an interrupt to service such case by an

interrupt service routine. Please see the Power On Reset (POR) / Brown Out Reset (BOR) section.

9.3.12 Global I/O

Up to 32 pins in UCD3138x can be configured in the Global I/O register to serve as a general purpose input or

output pins (GPIO). This includes all digital input or output pins except for the RESET pin.

The pins that cannot be configured as GPIO pins are the supply pins, ground pins, ADC-12 analog input pins,

EADC analog input pins and the RESET pin. Additional digital pins not listed in this register can be configured

through their local configuration registers.

There are two ways to configure and use the digital pins as GPIO pins:

1. Through the centralized Global I/O control registers.

2. Through the distributed control registers in the specific peripheral that shares it pins with the standard GPIO

functionality.

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