UCD3138128_15 Datasheet, PDF (42/80 Pages) Texas Instruments – UCD3138x Highly-Integrated Digital Controller For Isolated Power

UCD3138128, UCD3138A64
SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014
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9.3.13 Temperature Sensor Control
Temperature sensor control register provides internal temperature sensor enabling and trimming capabilities. The
internal temperature sensor is disabled by default.
Temperature
Calibration
ADC 12
Temperature
Sensor
CH15
Figure 27. Internal Temp Sensor
Temperature sensor is calibrated at room temperature (25 °C) via a calibration register value.
The temperature sensor is measured using ADC12 (via Ch15). The temperature is then calculated using a
mathematical formula involving the calibration register (this effectively adds a delta to the ADC measurement).
The temperature sensor can be enabled or disabled.
9.3.14 I/O Mux Control
I/O Mux Control register may be used in order to choose a single specific functionality that is desired to be
assigned to a physical device pin for your application. See the UCD3138x programmer's manual for details on
the available configurations.
9.3.15 Current Sharing Control
UCD3138x provides three separate modes of current sharing operation.
• Analog bus current sharing
• 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 UCD3138x
The simplified current sharing circuitry is shown in the drawing below. The digital pulse connected to SW3
transforms SW3 into a pulse-width-modulated current source. Details on the frequency and resolution of this
feature are in the digital power fusion peripherals manual.
42
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