MC68HC05JJ6 Datasheet, PDF (107/216 Pages) Freescale Semiconductor, Inc – General Release Specification Microcontrollers

Analog Subsystem
V_DD
INTERNAL
TEMPERATURE
DIODE
CHANNEL
SELECTION
BUS
PB0
+
COMP2
–
SAMPLE
CAP
V_SS
OFFSET
VOFF
MASK OPTION
(ENABLE = 1)
HOLD
DHOLD
Figure 8-3. Comparator 2 Input Circuit
Table 8-1. Comparator 2 Input Sources
Case
Hold
Sample
Voltage
HOLD
(AMUX)
DHOLD
(AMUX)
Mask
Option
Analog
Options
0
1
0
0
1
VOFF
(ASR)
X
0
1
Divided
Input
0
1
X
X
Direct
Input
1
0
X
X
Internal
Temperature 1
1
X
X
Diode
X = Don’t Care
Voltage
Offset
Source To Negative Input
of Comparator 2
No
Sample capacitor connected to comparator
2 negative input; very low leakage current.
Sample capacitor connected to comparator
Yes
2 negative input; bottom of capacitor
offset from V_SS by approximately 100 mV,
very low leakage current.
Signal on channel selection bus is divided
No
by 2 and connected to sample capacitor
and comparator 2 negative input
Signal on channel selection bus is
No
connected directly to sample capacitor
and comparator 2 negative input.
Internal temperature sensing diode
No
connected directly to sample capacitor
and comparator 2 negative input.
MC68HC05JJ6/MC68HC05JP6 — Rev. 3.2
Freescale Semiconductor
Analog Subsystem
General Release Specification
107