SPC5644BF0VLT1 Freescale Semiconductor, SPC5644BF0VLT1 Datasheet - Page 73

• Manufacturer Part Number: SPC5644BF0VLT1
• Description: 32-bit Microcontrollers - MCU 1.5M FLASH, 192K RAM
• Manufacturer: Freescale Semiconductor

Specifications of SPC5644BF0VLT1

• Rohs: yes
• Core: e200
• Processor Series: MPC5644C
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 120 MHz
• Program Memory Size: 1.5 MB
• Data Ram Size: 128 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 0.3 V to 6.2 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-208
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 62
• Interface Type: CAN, I2C, SCI, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 177
• Number Of Timers: 32
• Program Memory Type: Flash
• Supply Voltage - Max: 6.2 V
• Supply Voltage - Min: 0.3 V

path to ground. For instance, assuming a conversion rate of 1MHz, with CS+Cp
(Reqiv = 1 / (fc*(CS+Cp
by the voltage partitioning between this resistance (sampled voltage on CS+Cp
must be designed to respect the following relation
The formula above provides a constraint for external network design, in particular on resistive path.
A second aspect involving the capacitance network shall be considered. Assuming the three capacitances C
initially charged at the source voltage V
started (A/D switch close), a charge sharing phenomena is installed.
Freescale
V
A
Source
2
V
R
R
C
R
R
R
C
C
V
V
V
)), where fc represents the conversion rate at the considered channel). To minimize the error induced
CS
A
A2
A1
R
S
F
F
L
SW
AD
P
S
S
Source Impedance
Filter Resistance
Filter Capacitance
Current Limiter Resistance
Channel Selection Switch Impedance
Sampling Switch Impedance
Pin Capacitance (two contributions, C
Sampling Capacitance
1
Figure 17. Transient behavior during sampling phase
Voltage Transient on C
EXTERNAL CIRCUIT
MPC5646C Microcontroller DataSheet, Rev. 5.1
R
A
Filter
F
(refer to the equivalent circuit reported in
C
2
Figure 16. Input equivalent circuit
F
Current Limiter
V A
P1
R
and C

L
R S
-------------------- -
T
S
R EQ
P2
S
)
+
V <0.5 LSB
t
R F
C

P1

1
-- - LSB
2
1

< (R
2
INTERNAL CIRCUIT SCHEME
= R
SW
2
L
V
2
equal to 3pF, a resistance of 330K is obtained
(C
DD
) and the sum of R
+ R
S
+ C
Figure
AD
Selection
Channel
P1
R
) C
+ C
SW
16): when the sampling phase is
C
S
P2
P2
<< T
)
S
Sampling
S
Electrical Characteristics
+ R
R
AD
F
, the external circuit
C
S
F
, C
P1
and C
Eqn. 4
P2
73