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HC705JJ7GRS/D Datasheet(PDF) 121 Page - NXP Semiconductors

Part # HC705JJ7GRS/D
Description  Low-Cost, HC05 Core MCU in 20-Pin Package (MC68HC705JJ7) or 28-Pin Package (MC68HC705JP7)
PDF  230 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

HC705JJ7GRS/D Datasheet(HTML) 121 Page - NXP Semiconductors

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Analog Subsystem
A/D Conversion Methods
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
General Release Specification
Analog Subsystem
Table 8-4 gives the range of values of each parameter in the A/D timing
conversion; and Table 8-5 gives some A/D conversion examples for
several bit resolutions.
1. Limited by requirement for CEXT to be less than 2.0 µF.
Table 8-4. A/D Conversion Parameters
Name
Function
Min
Typ
Max
Units
VX
Unknown voltage on channel selection bus
VSS
—VDD –1.5
V
VCAP Charging voltage on external capacitor
VSS
—VDD –1.5
V
VMAX Maximum charging voltage on external capacitor
—
—
VDD –1.5
V
ICHG
Charging current on external ramping capacitor
VDD = 3 VDC
VDD = 5 VDC
Refer to 15.10 Analog Subsystem
Characteristics (5.0 Vdc) and 15.11 Analog
Subsystem Characteristics (3.0 Vdc)
IDIS
Discharge current on external ramping capacitor
Refer to 15.10 Analog Subsystem
Characteristics (5.0 Vdc) and 15.11 Analog
Subsystem Characteristics (3.0 Vdc)
tCHG
Time to charge external capacitor
(100 kHz < fOSC < 4.0 MHz)
4-bit result
6-bit result
8-bit result
10-bit result
12-bit result
0.032
0.128
0.512
2.048
8.192
0.128
0.512
2.048
8.196
32.768
2.56
10.24
40.96
120(1)
120(1)
ms
tDIS
Time to discharge external capacitor, CEXT
—
5
10
ms
/µF
CEXT Capacitance of external ramping capacitor
0.0001
0.1
2.0
µF
N
Number of counts for ICHG to charge CEXT to VX
1
1024
65536
counts
P
Prescaler into timing function (
÷ P)
Using core timer
Using 16-bit programmable timer
Using software loops
8
8
24
8
8
user defined
8
8
user defined
÷ P
fOSC
Clock source frequency
(excluding any prescaling)
Refer to 15.12 Control Timing (5.0 Vdc)
and 15.13 Control Timing (3.0 Vdc)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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