PAC5220 datasheet(46/73 Pages) ACTIVE-SEMI

46 / 73 page

PAC5220

Power Application Controller

13.2. Functional Description

13.2.1. ADC

The analog-to-digital converter (ADC) is a 10-bit succesive approximation register (SAR) ADC with 1 μs

conversion time and up to 1MSPS capability. The ADC input clock has a user-configurable divider from /1 to /8

of the system clock. The integrated analog multiplexer allows selection from up to 6 direct ADx inputs, and from

up to 10 analog inputs signals in the Configurable Analog Front End (CAFE), including up to 3 differential input

pairs. The ADC can be configured for repeating or non-repeating conversions and can interrupt the

microcontroller when a conversion is finished.

13.2.2. Auto-Sampling Sequencer

Two independent and flexible auto-sampling sequencer state machines allow signal sampling using the ADC

without interaction from microcontroller core. Each auto-sampling sequencer state machine can be programmed

to take and store up to 8 samples each in the ADC result register from different analog inputs, able to control the

ADC MUX and ADC Premux as well as the precise timing of the S/H in the Configurable analog frontend. The

sampling start of the auto-sampling sequencer can be precisely triggered using timers A, B, C, or D or any of

their associated PWM edges (high-to-low or low-to-high). It also supports manual start or a ping-pong-scheme,

where one auto-sampling sequencer state machine triggers the other when it finishes sampling.

The auto-sampling sequencer can interrupt the microcontroller when either conversion sequence is finished.

13.2.3. EMUX Control

A dedicated low latency interface controllable by the auto-sampling sequencer or register control allows

changing the ADC premultiplexer and asserting/deasserting the S/H circuit in the configurable analog front end,

allowing back to back conversions of multiple analog inputs without microcontroller interaction.

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Rev 1.0‒February 25, 2014

PAC5220 Datasheet(PDF) 46 Page - Active-Semi, Inc