MC68HC16Z1CFC16 Freescale Semiconductor, MC68HC16Z1CFC16 Datasheet - Page 209

• Manufacturer Part Number: MC68HC16Z1CFC16
• Description: IC MPU 1K RAM 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: HC16r

Specifications of MC68HC16Z1CFC16

• Core Processor: CPU16
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 132-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

8.8.6.2 Error Resulting from Leakage
M68HC16 Z SERIES
USER’S MANUAL
The external circuit described in
measuring an AC component of the external signal must take the characteristics of this
filter into account.
A series resistor limits the current to a pin, therefore input leakage acting through a
large source impedance can degrade A/D accuracy. The maximum input leakage cur-
rent is specified in
is greatest at high operating temperatures and as a general rule decreases by one half
for each 10 C decrease in temperature.
Assuming V
mV of input voltage. A typical input leakage of 50 nA acting through 100 k of external
series resistance results in an error of less than 1 count (5.0 mV). If the source imped-
ance is 1 M and a typical leakage of 50 nA is present, an error of 10 counts (50 mV)
is introduced.
In addition to internal junction leakage, external leakage (e.g., if external clamping di-
odes are used) and charge sharing effects with internal capacitors also contribute to
the total leakage current.
leakage on accuracy for different values of source impedance. The error is listed in
terms of 10-bit counts.
Filter Capacitor
Impedance
Table 8-10 External Circuit Settling Time (10-Bit Conversions)
.001 F
Source
100 pF
100 k
.01 F
10 k
.1 F
1 F
1 k
(C
Leakage from the part of 10 nA is obtainable only within a limited tem-
perature range.
F
Table 8-11 Error Resulting From Input Leakage (IOFF)
RH
)
– V
RL
APPENDIX A ELECTRICAL
Freescale Semiconductor, Inc.
= 5.12 V, 1 count (assuming 10-bit resolution) corresponds to 5
For More Information On This Product,
0.2 counts
760 s
760 ns
7.6 s
10 nA
100
76 s
76 ns
ANALOG-TO-DIGITAL CONVERTER
—
—
Table 8-11
Go to: www.freescale.com
Table 8-10
Leakage Value (10-Bit Conversions)
0.1 counts
1 count
7.6 ms
760 s
760 ns
7.6 s
50 nA
76 s
illustrates the effect of different levels of total
Source Resistance (R
1 k
CAUTION
—
is a low-pass filter. A user interested in
CHARACTERISTICS. Input leakage
0.2 counts
2 counts
100 nA
760 s
7.6 ms
7.6 s
10 k
76 ms
76 s
—
F
)
0.2 counts
20 counts
1000 nA
2 counts
100 k
760 ms
7.6 ms
760 s
76 ms
76 s
8-23