MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 195

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

8.11.1 Conversion Cycle Times
MC68336/376
USER’S MANUAL
VDDA
VSSA
PQA7
PQA0
PQB7
PQB0
VRH
VRL
Total conversion time is made up of initial sample time, transfer time, final sample time,
and resolution time. Initial sample time refers to the time during which the selected in-
put channel is connected to the sample capacitor at the input of the sample buffer am-
plifier. During the transfer period, the sample capacitor is disconnected from the
multiplexer, and the stored voltage is buffered and transferred to the RC DAC array.
During the final sampling period, the sample capacitor and amplifier are bypassed,
and the multiplexer input charges the RC DAC array directly. During the resolution pe-
riod, the voltage in the RC DAC array is converted to a digital value and stored in the
SAR.
Initial sample time is fixed at two QCLKs and the transfer time at four QCLKs. Final
sample time can be 2, 4, 8, or 16 ADC clock cycles, depending on the value of the IST
field in the CCW. Resolution time is ten cycles.
Transfer and resolution require a minimum of 18 QCLK clocks (8.6 s with a 2.1 MHz
QCLK). If the maximum final sample time period of 16 QCLKs is selected, the total
conversion time is 15.2 s with a 2.1 MHz QCLK.
CHARGE
PUMP
BIAS
AND
SAMPLE/
DUMMY
HOLD
DAC
CHAN. MUX
COMPAR-
QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE
MUX 4: 1
ATOR
16: 2
Figure 8-4 QADC Module Block Diagram
SAMPLE/
HOLD
RC-DAC
10-BIT
APPROXIMATION
SUCCESSIVE
REGISTER
EXTERNAL
TRIGGERS
SAMPLE
TIMER
RESULT TABLE
CONTROL REGISTERS
CCW TABLE
AND CONTROL LOGIC
ADDRESS
40-WORD
40-WORD
DECODE
10-BIT,
10-BIT,
RAM
RAM
PERIODIC
TIMER
PORT PQA
I/O
PRESCALER
ALIGNMENT
RESULT
CLOCK
PORT PQB
INPUT
ADDRESS
DECODE
MOTOROLA
QADC DETAIL BLOCK
MODULE
CLOCK
INTER-
INTER-
DATA
ADDR
FACE
BUS
BUS
IMB
8-13