EM6517 ETC, EM6517 Datasheet - Page 5

• Manufacturer Part Number: EM6517
• Description: 4 BIT MICROCONTROLLER
• Manufacturer: ETC

2
Full range ADC : Vref = V
For power saving one might connect the Vgnd resistor divider chain onto a port B output. This output should be
driving V
Limited range ADC : V
For power saving one might connect the Vgnd and the Vref resistor divider chain onto a port B output to V
This output should be driving V
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
Typical configurations
DD
Figure 4. Typical Application, Limited Range
Figure 3. Typical Application, Full Range
during the conversion and driving V
Reset
Strobe
Port A
Port B
Port C
32 KHz
Reset
Strobe
Port A
Port B
Port C
32 KHz
DD
SS
DD
> Vref > Vgnd, Vgnd=V
V
during the conversion and driving ‘high impedance’ in the ADC off state.
FOR ENGINEERING ONLY
V
, Vgnd = V
Main power
DD
DD
DD
Vreg Vss
Main power
during the conversion and driving Vss or high impedance in the ADC off state.
Vreg V
Vgnd
Vref
Vgnd
Vref
Ain
Bin
DD
Ain
Bin
SS
/2.
V
SS
Vref
DD
or high impedance in the ADC off state.
DD
R1
/2.
Vss or Vgnd
Vss
V
R1
DD
limited
range
ADC
R1
, or port driven
Full
range
ADC
Vss
R1
>1.3V
Vdd or Port B driven
+
-
C1
+
-
Vss
-| Vref - Vgnd |
+| Vref - Vgnd |
>1.3V
Vdd
Vref
Vgnd
Vss
© EM Microelectronic-Marin SA, 09/99, Rev. A/277
V
Vgnd
Vss
DD
EM6517
SS
5
.