MC68HC11EA9 Datasheet, PDF (54/58 Pages) Motorola, Inc – 8 BIT HCMOS SINGLE CHIP MICROCONTOROLLER WITH A/D CONVERTER

Freescale Semiconductor, Inc.
9 Analog-to-Digital Converter
The analog-to-digital (A/D) converter system uses an all-capacitive charge-redistribution technique to
convert analog signals to digital values. The MC68HC(7)11EA9 A/D converter system, a four-channel
multiplexed-input successive-approximation converter, is accurate to ±1 least significant bit (LSB). It
does not require external sample and hold circuits because of the type of charge-redistribution tech-
nique used.
Dedicated pins V_RH and V_RL provide the reference supply voltage inputs.
A multiplexer allows the single A/D converter to select one of 16 analog signals.
PE0
AN0
PE1
AN1
PE2
AN2
PE3
AN3
ANALOG
MUX
PE4
AN4
PE5
AN5
PE6
AN6
PE7
AN7
8-BIT CAPACITIVE DAC
WITH SAMPLE AND HOLD
SUCCESSIVE APPROXIMATION
REGISTER AND CONTROL
RESULT
ADCTL A/D CONTROL
V_RH
V_RL
INTERNAL
DATA BUS
RESULT REGISTER INTERFACE
ADR1 A/D RESULT 1
ADR2 A/D RESULT 2
ADR3 A/D RESULT 3
ADR4 A/D RESULT 4
Figure 14 A/D Block Diagram
EA9 A/D BLOCK
MC68HC11EA9
54
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MC68HC11EA9TS/D
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