LOGIC COMMANDS AND REGISTERS ANALOG INPUT " />
參數(shù)資料
型號(hào)： KIT908EINTFC
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 18/49頁(yè)
文件大小： 0K
描述： KIT EVAL 908E625 QUAD W/MCU/LIN
標(biāo)準(zhǔn)包裝： 1
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
908E625
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
ANALOG INPUT PA1
The Analog input PA1 pin provides an input for reading
analog signals and is internally connected to the analog
multiplexer. It can be used for reading switches,
potentiometers or resistor values, etc.
ANALOG INPUT PA1 CURRENT SOURCE
The analog input PA1 has an additional selectable current
source. It enables the reading of switches, NTC, etc., without
the need of an additional supply line for the sensor illustrated
in Figure 12. With this feature it is also possible to read
multiple switches on one input.
Current source is enabled if the PSON bit in the System
Control Register (SYSCTL) and the CSEN bit in the Power
Output Register (POUT) is set.
Four different current source values can be selected with the CSSELx bits
shown in Table 8. This function ceases during STOP mode operation.
Figure 12. Analog Input PA1 and Multiplexer
Table 7. Analog Multiplexer Configuration Register
SS3
SS2
SS1
SS0
Channel
0
Current Recopy HB1
0
1
Current Recopy HB2
0
1
0
Current Recopy HB3
0
1
Current Recopy HB4
0
1
0
VSUP Prescaler
0
1
0
1
Temperature Sensor
0
1
0
Not Used
0
1
PA1 Pin
1
0
Not Used
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Table 8. PA1 Current Source Level Selection Bits
CSSEL1 CSSEL0
Current Source Enable (typ.)
0
10%
0
1
30%
1
0
60%
1
100%
Analog
Multiplexer
ADOUT
NTC
PSON
CSEN
CSSEL
SSx
3
Source Selection Bits
VDD
PA1
Analog Input PA1
Selectable
Current
Source
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