Package Id Information - Texas Instruments UCD3138 Technical Reference Manual

Package ID Information

9.1 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 decision makings.
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
9.2 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 device supply
voltage is lower than brownout threshold, it 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 refer to Section 3.6 of UCD3138 device datasheet for more information about specific Brownout
threshold levels.
9.3 Temperature Sensor Control
Temperature sensor control register provides internal temperature sensor enabling and trimming
capabilities. The internal temperature sensor is disabled as default.
9.4 I/O Mux Control
In different package versions of UCD3138, different I/O functions are multiplexed and routed toward a
single physical pin. Consult the UCD3138 device datasheet for specific information related to each
version.
I/O Mux Control register may be used in order to choose a specific functionality that is desired to be
assigned to a physical device pin.
Please note that the default value of IOMUX does not configure the TDO pin as a JTAG pin. Hence,
IOMUX configuration must be changed in order to implement JTAG communication to UCD3138.
9.5 Current Sharing Control
UCD3138 provides three separate modes of current sharing operation.
• Analog bus current sharing
• PWM bus current sharing
• Master/Slave current sharing
A simplified schematic of the current sharing circuitry integrated in UCD3138 is shown in the drawing
below:
334
Advanced Power Management Control Functions
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Copyright © 2016, Texas Instruments Incorporated
Figure 9-1.
PKG_ID
R/W-00
SNIU028A – February 2016 – Revised April 2016
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