UCD3138 datasheet(49/68 Pages) TI1

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Front End

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Front End

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External GPIO

Detection

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Automated Ramp

DCM Detection

HFO/LFO

Fail Detect

UCD3138

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SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012

Figure 4-2. Fault Mux Block Diagram

4.15 Communication Ports

4.15.1 SCI (UART) Serial Communication Interface

A maximum of two independent Serial Communication Interface (SCI) or Universal Asynchronous

Receiver/Transmitter (UART) interfaces are included within the device for asynchronous start-stop serial

data communication (see the pin out sections for details) Each interface has a 24 bit prescaler for

supporting programmable baud rates and has programmable data word and stop bit options. Half or full

duplex operation is configurable through register bits. A loop back feature can also be setup for firmware

verification. Both SCI-TX and SCI-RX pin sets can be used as GPIO pins when the peripheral is not being

used.

4.15.2 PMBUS

The PMBus Interface supports independent master and slave modes controlled directly by firmware

through a processor bus interface. Individual control and status registers enable firmware to send or

receive I2C, SMBus or PMBus messages in any of the accepted protocols, in accordance with the I2C

Specification, SMBus Specification (Version 2.0) and the PMBUS Power System Management Protocol

Specification.

The PMBus interface is controlled through a processor bus interface, utilizing a 32-bit data bus and 6-bit

address bus. The PMBus interface is connected to the expansion bus, which features 4 byte write

enables, a peripheral select dedicated for the PMBus interface, separated 32-bit data buses for reading

and writing of data and active-low write and output enable control signals. In addition, the PMBus Interface

connects directly to the I2C/SMBus/PMBus Clock, Data, Alert, and Control signals.

Example: PMBus Address Decode via ADC12 Reading

The user can allocate 2 pins of the 12-bit ADC input channels, AD_00 and AD_01, for PMBus address

decoding. At power-up the device applies IBIAS to each address detect pin and the voltage on that pin is

captured by the internal 12-bit ADC.

Where bin(VAD0x) is the address bin for one of 12 address as shown inFigure 4-3.

Functional Overview

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