MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 197

• 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: -

8.11.2 Front-End Analog Multiplexer
8.11.3 Digital to Analog Converter Array
MC68336/376
USER’S MANUAL
The internal multiplexer selects one of the 16 analog input pins or one of three special
internal reference channels for conversion. The following are the three special chan-
nels:
The selected input is connected to one side of the DAC capacitor array. The other side
of the DAC array is connected to the comparator input. The multiplexer also includes
positive and negative stress protection circuitry, which prevents other channels from
affecting the current conversion when voltage levels are applied to the other channels.
Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for specific voltage level
limits.
The digital to analog converter (DAC) array consists of binary-weighted capacitors and
a resistor-divider chain. The array serves two purposes:
Resolution begins with the MSB and works down to the LSB. The switching sequence
is controlled by the digital logic.
• V
• V
• V
• The array holds the sampled input voltage during conversion.
• The resistor-capacitor array provides the mechanism for the successive approx-
imation A/D conversion.
RH
RL
DDA
— Reference Voltage Low
— Reference Voltage High
QCLK
/2 — Mid-Analog Supply Voltage
QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE
Figure 8-6 Bypass Mode Conversion Timing
N CYCLES:
(2, 4, 8, 16)
SAMPLE
SAMPLE
TIME
TIME
SUCCESSIVE APPROXIMATION RESOLUTION
RESOLUTION
SEQUENCE
10 CYCLES
TIME
QADC BYP CONVERSION TIM
MOTOROLA
8-15