R5F213J6CNNP#U0 Renesas Electronics America, R5F213J6CNNP#U0 Datasheet - Page 628
R5F213J6CNNP#U0
Manufacturer Part Number
R5F213J6CNNP#U0
Description
MCU 1KB FLASH 32K ROM 36-QFN
Manufacturer
Renesas Electronics America
Series
R8C/3x/3JCr
Datasheet
1.R5F213J6CNNPU0.pdf
(750 pages)
Specifications of R5F213J6CNNP#U0
Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
I²C, LIN, SIO, SSU, UART/USART
Peripherals
POR, PWM, Voltage Detect, WDT
Number Of I /o
31
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
2.5K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 10x10b, D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
36-WQFN Exposed Pad, 36-HWQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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R8C/3JC Group
REJ09B0602-0100 Rev.1.00
May 12, 2010
28.9
Figure 28.10
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 28.10 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 28.10 shows the 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.
T = 0.75 µ s when φ AD = 20 MHz. 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 3.5 k Ω . maximum.
Output Impedance of Sensor under A/D Conversion
VC is generally
And when t = T,
Hence,
T = 0.75 µ s, R = 10 k Ω , C = 6.0 pF, X = 0.1, and Y = 1024. Hence,
R0
Analog Input Pin and External Sensor Equivalent Circuit
=
R0
–
-------------------------------------------------- -
6.0
=
×
–
0.75
VC
10
-------------------
C
Sensor equivalent
circuit
VC
•
–
VIN
–
e
T
12
=
×
ln
–
--------------------------
C R0
10
•
VIN 1 e
X
--- -
Y
=
--------------------------T
C R0
(
ln
(
6 –
–
VIN
1
----------- -
1024
R
0.1
1
+
+
R0
R
–
–
R
)
–
X
--- - VIN
Y
T
10
)
–
=
× 10
--------------------------
C R0
=
ln
(
X
--- -
Y
X
--- -
Y
3
1
=
≈
+
3.5
MCU
VIN 1
R
C (6.0 pF)
× 10
)
R (10 kΩ)
t
3
–
X
--- -
Y
VC
28. A/D Converter
Page 597 of 715
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