R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 144

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 14.8 Internal Equivalent Circuit to Analog Input
14.5 Internal Equivalent Circuit of Analog Input
Figure 14.8 shows the internal equivalent circuit of analog input.
Parasitic
Parasitic
Jan 27, 2006
AN0
diode
diode
Warning: Use only as a standard for designing this data.
AV
V
Control signal
for SW2
Control signal
for SW3
REF
Comparison reference voltage (Vref) generator
SS
ANi
i =10
V
V
CC
SS
A/D control register 0
Mass production may cause some changes in device characteristics.
ON resistor
approx. 2k
ON resistor
approx. 2k
b2
V
page 133 of 205
CC
SW1
SW1
b1
i ladder-type
switches
(i = 10)
V
b0
SS
Sampling
Connect to
Connect to
Wiring resistor
approx. 0.2k
Wiring resistor
approx. 0.2k
Resistor
ladder
Comparison
Connect to
Connect to
i ladder-type
wiring resistors
(i = 10)
ON resistor
approx. 0.6k
Reference control
ON resistor
approx. 0.6k
SW2
control signal
SW2
Sampling
signal
Analog input voltage
V
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.
Vref
Comparison voltage
IN
14.5 Internal Equivalent Circuit of Analog Input
C = Approx.1.5pF
SW4
AV
AV
SS
A/D successive
conversion register
CC
ON resistor
approx. 5k
SW3
Chopper-type
amplifier
AMP
A/D conversion
interrupt request