PAC5253 datasheet(44/68 Pages) ACTIVE-SEMI

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PAC5253

Power Application Controller

13. ADC WITH AUTO-SAMPLING SEQUENCER

13.1. Block Diagram

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 front end. 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.

- 44 -

Rev 1.10‒January 28, 2016

Figure 13-1. ADC with Auto-Sampling Sequencer

ADC

ADC WITH AUTO-SAMPLING SEQUENCER

ADx

TEMP

, V

MON

, V

REF

EMUX

S/H

10-BIT

ADC

DAxP

DAxN

DIFFERENTIAL PGA

DIFF-PGA

CONFIGURABLE ANALOG FRONT END

AUTO-SAMPLING

SEQUENCER

ADC RESULT REGISTERS

(16)

EMUX CONTROL

STATE MACHINE 1

STATE MACHINE 0

PAC5253 Datasheet(PDF) 44 Page - Active-Semi, Inc

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