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| 型號(hào)： | EM6617VVVST11A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.032768 MHz, RISC MICROCONTROLLER |
| 封裝： | STICKY TAPE |
| 文件頁(yè)數(shù)： | 5/66頁(yè) |
| 文件大小： | 759K |
| 代理商： | EM6617VVVST11A |
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EM6617-1
EM Microlectronic-Marin SA , 3/99 Rev. B/258
5
2. Typical configurations
Full range ADC :
Vref = V
DD
, Vgnd = V
DD
/2.
For power saving one might connect the Vgnd resistor divider chain onto a port B output. This output should be
driving V
DD
during the conversion and driving V
SS
or high impedance in the ADC off state.
Limited range ADC :
V
DD
> Vref > Vgnd, Vgnd=V
DD
/2.
For power saving one might connect the Vgnd and the Vref resistor divider chain onto a port B output to V
SS
.
This output should be driving V
DD
during the conversion and driving Vss or high impedance in the ADC off state.
other possibility:
VREF = VregLogic, VGND = VregLogic/2
For power saving one might connect the Vgnd resistor divider chain from VregLogic onto a port B output. This
output should be driving V
SS
during the conversion and driving ‘high impedance’ in the ADC off state.
Figure 3. Typical Application, Full Range
Main power
≈
Vreg V
SS
Vss
R1
R1
Vss
Ain
Bin
Port C
Port B
Strobe
Reset
Port A
Vref
Vgnd
V
DD
V
DD
, or port driven
V
DD
32 KHz
>1.3V
V
DD
Vgnd
Vss
+
-
Full
range
ADC
Figure 4. Typical Application, Limited Range
Main power
≈
Vreg Vss
Vss or Vgnd
>1.3V
Vdd or Port B driven
R1
C1
R1
Vss
Ain
Bin
Vref
Vgnd
V
DD
32 KHz
limited
range
ADC
Vref
Vref
Vgnd
+
-
Vdd
Vss
+| Vref - Vgnd |
-| Vref - Vgnd |
Port C
Port B
Strobe
Reset
Port A
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