MC68HC11E Motorola, MC68HC11E Datasheet - Page 64

• Manufacturer Part Number: MC68HC11E
• Description: Microcontrollers
• Manufacturer: Motorola

Analog-to-Digital (A/D) Converter
Data Sheet
64
PE0
AN0
PE1
AN1
PE2
AN2
PE3
AN3
PE4
AN4
PE5
AN5
PE6
AN6
PE7
AN7
ANALOG
INPUT
PIN
* THIS ANALOG SWITCH IS CLOSED ONLY DURING THE 12-CYCLE SAMPLE TIME.
Figure 3-2. Electrical Model of an A/D Input Pin (Sample Mode)
ADR1 A/D RESULT 1
ANALOG
PROTECTION
MUX
< 2 pF
DEVICE
INPUT
Freescale Semiconductor, Inc.
Figure 3-1. A/D Converter Block Diagram
+ ~20 V
– ~0.7 V
For More Information On This Product,
RESULT
ADR2 A/D RESULT 2
Analog-to-Digital (A/D) Converter
Go to: www.freescale.com
SUCCESSIVE APPROXIMATION
+ ~12V
– ~0.7V
DUMMY N-CHANNEL
OUTPUT DEVICE
REGISTER AND CONTROL
WITH SAMPLE AND HOLD
RESULT REGISTER INTERFACE
8-BIT CAPACITIVE DAC
ADR3 A/D RESULT 3
DIFFUSION/POLY
ADCTL A/D CONTROL
JUNCTION
LEAKAGE
400 nA
COUPLER
ð 4 kΩ
ADR4 A/D RESULT 4
~ 20 pF
*
M68HC11E Family — Rev. 5
CAPACITANCE
V
RL
DAC
V
V
INTERNAL
DATA BUS
RH
Rl
MOTOROLA