R5F21236JFP Renesas Electronics America, R5F21236JFP Datasheet - Page 434
R5F21236JFP
Manufacturer Part Number
R5F21236JFP
Description
MCU 3/5V 32K+2K 48-LQFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/R8C/Tiny/23r
Datasheet
1.R5F21237DFPU0.pdf
(551 pages)
Specifications of R5F21236JFP
Core Processor
R8C
Core Size
16-Bit
Speed
20MHz
Connectivity
CAN, I²C, LIN, SIO, SSU, UART/USART
Peripherals
POR, Voltage Detect, WDT
Number Of I /o
41
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-LQFP
For Use With
RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
19.6
Figure 19.11
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 19.11 has to be completed
within a specified period of time. T (sampling time) as the specified time. Let output impedance of sensor
equivalent circuit be R0, internal resistance of microcomputer be R, precision (error) of the A/D converter be X,
and the resolution of A/D converter be Y (Y is 1024 in the 10-bit mode, and 256 in the 8-bit mode).
Figure 19.11 shows Analog Input Pin and External Sensor Equivalent Circuit. When the difference between VIN
and VC becomes 0.1LSB, we find impedance R0 when voltage between pins VC changes from 0 to VIN (0.1/1024)
VIN in time T. (0.1/1024) means that A/D precision drop due to insufficient capacitor charge is held to 0.1LSB at
time of A/D conversion in the 10-bit mode. Actual error however is the value of absolute precision added to
0.1LSB.
When f(XIN) = 10 MHz, T = 0.25 µs in the A/D conversion mode without sample & hold. Output impedance R0
for sufficiently charging capacitor C within time T is determined as follows.
Thus, the allowable output impedance of the sensor equivalent circuit, making the precision (error) 0.1LSB or less,
is approximately 1.7 kΩ maximum.
Output Impedance of Sensor Under A/D Conversion
VC is generally VC = VIN 1 - e
And when t = T, VC = VIN -
Hence, R0 = -
T = 0.25 µs, R = 2.8 kΩ, C = 6.0 pF, X = 0.1, and Y = 1024. Hence,
R0 = -
Analog Input Pin and External Sensor Equivalent Circuit
6.0 × 10
0.25 × 10
C 1n
-12
Page 412 of 501
-
e
T
C(R0 + R)
-
NOTE:
1n
C(R0 + R)
X
Y
-6
Sensor equivalent circuit
1024
1. The capacity of the terminal is assumed to be 4.5 pF
0.1
1
-R
1
VIN
- 2.8 × 10
T
X
Y
T
= 1n
VIN = VIN 1 -
=
-
C(R0 + R)
X
Y
X
Y
R0
1
3
~ ~
1.7 × 10
t
X
Y
MCU
3
R(2.8kΩ)
C(6.0pF)
VC
19. A/D Converter
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