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EM6617 Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA

Part No. EM6617
Description  Ultra Low Power Microcontroller with ADC AND EEPROM
Download  65 Pages
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
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EM6617 Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA

 
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EM6617
Copyright
© 2005, EM Microelectronic-Marin SA
5
www.emmicroelectronic.com
2. Typical configurations
Full range ADC : Vref = VDD, Vgnd = VDD/2.
For power saving one might connect the Vgnd resistor divider chain onto a port B output. This output should be
driving VDD during the conversion and driving VSS or high impedance in the ADC off state.
Limited range ADC : VDD > Vref > Vgnd, Vgnd=VDD/2.
For power saving one might connect the Vgnd and the Vref resistor divider chain onto a port B output to VSS. This
output should be driving VDD 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 VSS during the conversion and driving ‘high impedance’ in the ADC off state.
Figure 3. Typical Application, Full Range
Main power
Vreg VSS
Vss
R1
R1
Vss
Ain
Bin
Port C
Port B
Strobe
Reset
Port A
Vref
Vgnd
VDD
VDD, or port driven
VDD
32 KHz
>1.3V
VDD
Vss
Vgnd
+
-
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
VDD
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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