MMCCMB2107 Freescale, MMCCMB2107 Datasheet - Page 444

• Manufacturer Part Number: MMCCMB2107
• Manufacturer: Freescale

Specifications of MMCCMB2107

• Lead Free Status / RoHS Status: Not Compliant

Queued Analog-to-Digital Converter (QADC)
18.9.2.2 Module Version Options
Technical Data
444
Figure 18-18
multiplexer chips connected to the QADC. The external multiplexer chips
select one of four analog inputs and connect it to one analog output,
which becomes an input to the QADC. The QADC provides two
multiplexed address signals — MA[1:0] — to select one of four inputs.
These inputs are connected to all four external multiplexer chips. The
analog output of the four multiplex chips are each connected to separate
QADC inputs (ANw, ANx, ANy, and ANz) as shown in
When the external multiplexed mode is selected, the QADC
automatically creates the MA output signals from the channel number in
each CCW. The QADC also converts the proper input channel (ANw,
ANx, ANy, and ANz) by interpreting the CCW channel number. As a
result, up to 16 externally multiplexed channels appear to the conversion
queues as directly connected signals. The software simply puts the
channel number of externally multiplexed channels into CCWs.
Figure 18-18
pins. When external multiplexing is selected, none of the MA pins can be
used for analog or digital inputs. They become multiplexed address
outputs and are unaffected by DDRQA[1:0].
The number of available analog channels varies, depending on whether
external multiplexing is used. A maximum of 16 analog channels are
supported by the internal multiplexing circuitry of the converter.
Table 18-12
with 0 to four external multiplexer chips.
1. The external trigger inputs are not shared with two analog input pins.
2. When external multiplexing is used, two input channels can be configured as multiplexed
No External
Freescale Semiconductor, Inc.
address outputs, and for each external multiplexer chip, one input channel is a multiplexed
analog input.
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
Mux
Directly Connected + External Multiplexed = Total Channels
8
Go to: www.freescale.com
shows the total number of analog input channels supported
shows the maximum configuration of four external
shows that the two MA signals may also be analog input
One External
Number of Analog Input Channels Available
Table 18-12. Analog Input Channels
5 + 4 = 9
Mux
Two External
4 + 8 = 12
Muxes
Three External
3 + 12 = 15
Muxes
MMC2107 – Rev. 2.0
Figure
Four External
2 + 16 = 18
(1), (2)
MOTOROLA
Muxes
18-18.