R8C10 Datasheet, PDF (121/199 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

R8C/10 Group
14.5 Internal Equivalent Circuit of Analog Input
14.5 Internal Equivalent Circuit of Analog Input
Figure 14.8 shows the internal equivalent circuit of analog input.
VCC
Parasitic
diode
AN0
Parasitic
diode
VSS
i =10
ANi
VCC VSS
AVCC
ON resistor
ON resistor
approx. 2kΩ
Wiring resistor ^{approx. 0.6kΩ}
approx. 0.2kΩ
Analog input voltage
C = Approx.1.5pF
AMP
SW1
SW2 ^VIN
ON resistor
approx. 5kΩ
Sampling
control signal
i ladder-type
switches
(i = 10)
i ladder-type
wiring resistors
(i = 10)
ON resistor
approx. 2kΩ
Wiring resistor
approx. 0.2kΩ
SW4
SW3
Chopper-type
AVSS ^amplifier
SW1
b2 b1 b0
A/D control register 0
Reference control
signal
A/D successive
conversion register
VREF
AVSS
Resistor
ladder
Vref
SW2 Comparison voltage
ON resistor
approx. 0.6kΩ
Comparison reference voltage (Vref) generator
A/D conversion
interrupt request
Control signal
for SW2
Control signal
for SW3
Sampling
Comparison
Connect to
Connect to
Connect to
Connect to
SW1 conducts only on the ports selected for analog input.
SW2 and SW3 are open when A/D conversion is not in progress;
their status varies as shown by the waveforms in the diagrams on the left.
SW4 conducts only when A/D conversion is not in progress.
Warning: Use only as a standard for designing this data.
Mass production may cause some changes in device characteristics.
Figure 14.8 Internal Equivalent Circuit to Analog Input
Rev.1.20 Jan 27, 2006 page 111 of 180
REJ09B0019-0120