m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 246

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.9.23. Internal equivalent circuit to analog input
2.9.12 Internal Equivalent Circuit of Analog Input
Figure 2.9.23 shows the internal equivalent circuit of analog input.
Parasitic
diode
A N 0
P a r a s i t i c
d i o d e
C o n t r o l s i g n a l
f o r S W 3
Control signal
for SW2
V
A V s s
V s s
REF
AN i
V c c
AD control register 0
Warning: Use only as a standard for designing this data.
O N r e s i s t o r
a p p r o x . 2 k
O N r e s i s t o r
a p p r o x . 2 k
b2 b1 b0
V c c V s s
page 237 of 354
S W 1
S W 1
Connect to
Comparison reference voltage (Vref) generator
C o n n e c t t o
( i = 1 0 )
s w i t c h e s
Mass production may cause some changes in device characteristics.
i l a d d e r - t y p e
Sampling
R e s i s t o r
W i r i n g r e s i s t o r
a p p r o x . 0 . 2 k
l a d d e r
O N r e s i s t o r
a p p r o x . 0 . 2 k
C o n n e c t t o
Connect to
Comparison
(i = 10)
i l a d d e r - t y p e
w i r i n g r e s i s t o r s
Reference control
O N r e s i s t o r
a p p r o x . 0 . 6 k
ON resistor
approx. 0.6k
c o n t r o l s i g n a l
signal
S W 2
SW2'
S a m p l i n g
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.
Analog input voltage
V
Comparison voltage
Vref
I N
C = Approx. 3.0pF
SW4
A V s s
AVcc
A D s u c c e s s i v e c o n v e r s i o n
ON resistor,
approx. 5k
S W 3
r e g i s t e r
AMP
Chopper-type
amplifier
A D T / A / D c o n v e r s i o n
i n t e r r u p t r e q u e s t
2. A/D Converter