UCD3138RMHT.A datasheet(45/99 Pages) TI2

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The counter reset can be configured to happen on a counter roll over, a compare equal event, or by a software

controlled register. Interrupts from the PWM timer can be set due to the counter rollover event (overflow) or

by the two comparison match events. Each comparison match and the overflow interrupts can be disabled or

enabled.

Upon an event comparison, the PWM pin can be configured to set, clear, toggle or have no action at the output.

The value of PWM pin output can be read for status or simply configured as General Purpose I/O for reading the

value of the input at the pin.

9.5.5.4.3 Watchdog Timer

A watchdog timer is provided on the device for ensuring proper firmware loop execution. The timer is clocked

off of a separate low speed oscillator source. If the timer is allowed to expire, a reset condition is issued to the

ARM processor. The watchdog is reset by a simple CPU write bit to the watchdog key register by the firmware

routine. On device power-up the watchdog is disabled. Yet after it is enabled, the watchdog cannot be disabled

by firmware. Only a device reset can put this bit back to the default disabled state. A half timer flag is also

provided for status monitoring of the watchdog.

9.5.6 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.

The MAC registers and peripherals are all available in the UCD3138 (64 pin version). Other UCD3138 devices

may have reduced resources. See the device pin out description for details.

9.5.7 Package ID Information

Package ID register includes information regarding the package type of the device and can be read by firmware

for reporting through PMBus or for other package sensitive decisions.

BIT NUMBER

1:0

Bit Name

PKG_ID

Access

R/W

Default

0 – UCD3138RGC,

1 – UCD3138RHA

9.5.8 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.

9.5.9 Global I/O

Up to 30 pins in UCD3138 can be configured to serve as a general purpose input or output pin (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.

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

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

www.ti.com

UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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