MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 87

• Manufacturer Part Number: MC908AP32CFBE
• Manufacturer: Freescale

Specifications of MC908AP32CFBE

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• Total Internal Ram Size: 2KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PQFP
• Program Memory Type: Flash
• Program Memory Size: 32KB
• Lead Free Status / RoHS Status: Compliant

6.3.9 CGM External Connections
In its typical configuration, the CGM requires up to four external components.
Figure 6-3
Care should be taken with PCB routing in order to minimize signal cross talk and noise. (See
Acquisition/Lock Time Specifications
performance.)
6.4 I/O Signals
The following paragraphs describe the CGM I/O signals.
6.4.1 External Filter Capacitor Pin (CGMXFC)
The CGMXFC pin is required by the loop filter to filter out phase corrections. An external filter network is
connected to this pin. (See
6.4.2 PLL Analog Power Pin (V
V
potential as the V
Freescale Semiconductor
DDA
•
•
is a power pin used by the analog portions of the PLL. Connect the V
Bypass capacitor, C
Filter network
shows the external components for the PLL:
To prevent noise problems, the filter network should be placed as close to
the CGMXFC pin as possible, with minimum routing distances and no
routing of other signals across the network.
Route V
capacitors as close as possible to the package.
DD
Note: Filter network in box can be replaced with a 0.47µF capacitor, but will degrade stability.
pin.
DDA
BYP
Figure
carefully for maximum noise immunity and place bypass
MCU
Figure 6-3. CGM External Connections
0.22 µF
MC68HC908AP Family Data Sheet, Rev. 4
6-3.)
1 kΩ
DDA
for routing information, filter network and its effects on PLL
)
CGMXFC
NOTE
NOTE
10 nF
V
SSA
V
DDA
C
0.1 µF
BYP
DDA
V
DD
pin to the same voltage
6.8
I/O Signals
87