參數(shù)資料
型號(hào): QADCRM
英文描述: Queued Analog-to-Digital Converter Reference Manual
中文描述: 排隊(duì)模擬到數(shù)字轉(zhuǎn)換器參考手冊(cè)
文件頁數(shù): 30/122頁
文件大小: 940K
代理商: QADCRM
MOTOROLA
4-2
EXTERNAL MULTIPLEXING
QADC
REFERENCE MANUAL
Figure 4-1 Example of External Multiplexing
When the external multiplexed mode is selected, the QADC automatically creates the
MA open drain output signals from the channel number in each CCW. The QADC also
converts the proper input channel (AN
w
, AN
x
, AN
y
, and AN
z
) by interpreting the CCW
channel number. As a result, up to 32 externally multiplexed channels appear to the
conversion queues as directly connected signals. The software simply puts the chan-
nel number of externally multiplexed channels into CCWs. Refer to
Table 7-9
in
SEC-
TION 7 DIGITAL CONTROL
which shows the channel numbers for the externally
multiplexed channels that are assigned the range of channel 0 to channel 31.
Figure 4-1
shows that the three MA signals may also be analog input pins. When ex-
ternal multiplexing is selected, none of the MA pins can be used for analog or digital
inputs. They become multiplexed address outputs.
QADC EXT MUX CONN
AN52/MA0/PQA0
*
AN53/MA1/PQA1
*
AN54/MA2/PQA2
*
AN55/ETRIG1/PQA3
*
AN56/ETRIG2/PQA4
*
AN57/PQA5
*
AN58/PQA6
*
AN59/PQA7
*
AN0/ANW/PQB0
AN1/ANX/PQB1
AN2/ANY/PQB2
AN3/ANZ/PQB3
AN48/PQB4
AN49/PQB5
AN50/PQB6
AN51/PQB7
DIGITAL RESULTS
AND CONTROL
ANALOG
CONVERTER
ANALOG
MULTIPLEXER
VSSE
QADC
VDDA
VRH
VSSA
VRL
MUX
AN0
AN2
AN4
AN6
AN8
AN10
AN11
AN12
MUX
AN1
AN3
AN5
AN7
AN9
AN11
AN13
AN15
MUX
AN16
AN18
AN20
AN22
AN24
AN26
AN28
AN30
MUX
AN17
AN19
AN21
AN23
AN25
AN27
AN29
AN31
ANALOG POWER
ANALOG REFERENCES
EXTERNAL TRIGGERS
P
P
*
* PORT A PINS INCORPORATE OPEN DRAIN PULL DOWN DRIVERS.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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