MC68HC16Z1CEH16 Freescale Semiconductor, MC68HC16Z1CEH16 Datasheet - Page 208

• Manufacturer Part Number: MC68HC16Z1CEH16
• Description: IC MCU 16BIT 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: HC16r

Specifications of MC68HC16Z1CEH16

• 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
• Processor Series: HC16Z
• Core: CPU16
• Data Bus Width: 16 bit
• Controller Family/series: 68HC16
• No. Of I/o's: 26
• Ram Memory Size: 1KB
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Embedded Interface Type: QSPI, SCI
• Rohs Compliant: Yes
• Package: 132PQFP
• Family Name: HC16
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Number Of Programmable I/os: 16
• On-chip Adc: 8-chx10-bit
• Number Of Timers: 11
• Data Ram Size: 1 KB
• Interface Type: SCI, SPI, UART
• Maximum Clock Frequency: 16 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

8.8.6.1 Settling Time for the External Circuit
8-22
In
sample capacitor. Each channel has its own capacitor. C
tains the value of the last sample. V
the DAC capacitor array (C
2, or 2.5 volts for 5-volt operation.
The following paragraphs provide a simplified description of the interaction between
the ADC and the user's external circuitry. This circuitry is assumed to be a simple RC
low-pass filter passing a signal from a source to the ADC input pin. The following sim-
plifying assumptions are made:
The values for R
required to charge C
At time t = 0, S1 in
from the external circuitry. Assume that the initial voltage across CF is zero. As CF
charges, the voltage across it is determined by the following equation, where t is the
total charge time:
When t = 0, the voltage across C
(This assumes no internal leakage.) With 10-bit resolution, 1/2 of a count is equal to
1/2048 full-scale value. Assuming worst case (V
the required time for C
during 10-bit conversions.
Figure
• The source impedance is included with the series resistor of the RC filter.
• The external capacitor is perfect (no leakage, no significant dielectric absorption
• All parasitic capacitance associated with the input pin is included in the value of
• Inductance is ignored.
• The “on” resistance of the internal switches is zero ohms and the “off” resistance
characteristics, etc.)
the external capacitor.
is infinite.
8-10, R
The following times are completely independent of the A/D converter
architecture (assuming the ADC is not affecting the charging).
F
F
and C
Figure 8-10
and C
Freescale Semiconductor, Inc.
F
For More Information On This Product,
to the source voltage level (V
F
to charge to within 1/2 of a count of the actual source voltage
F
ANALOG-TO-DIGITAL CONVERTER
F
in the user's external circuitry determine the length of time
Table 8-10
DAC
comprise the user's external filter circuit. C
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) before each sample. The value of this supply is V
V
closes. S2 is open, disconnecting the internal circuitry
CF
F
= 0. As t approaches infinity, V
=
I
is an internal voltage source used to precharge
is based on the RC network in
V
SRC
NOTE
1 e
–
SRC
t – R
SRC
F
= full scale),
C
).
F
S
is never precharged; it re-
CF
Table 8-10
M68HC16 Z SERIES
will equal V
Figure
S
USER’S MANUAL
is the internal
8-10.
shows
DDA
SRC
/
.