R5F21324ANSP#U1 Renesas Electronics America, R5F21324ANSP#U1 Datasheet - Page 493
R5F21324ANSP#U1
Manufacturer Part Number
R5F21324ANSP#U1
Description
MCU 1KB FLASH 16K ROM 20-LSSOP
Manufacturer
Renesas Electronics America
Series
R8C/3x/32Ar
Datasheet
1.R5F21322ANSPU1.pdf
(629 pages)
Specifications of R5F21324ANSP#U1
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
15
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
20-LSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Under development
R8C/32A Group
REJ09B0458-0020 Rev.0.20
Page 463 of 583
27.9
Figure 27.10
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 27.10 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 27.10 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.
T = 0.75 µs when φAD = 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 kΩ. maximum.
Output Impedance of Sensor under A/D Conversion
VC is generally
And when t = T,
Hence,
T = 0.75 µs, R = 10 kΩ, C = 6.0 pF, X = 0.1, and Y = 1024. Hence,
R0
Preliminary specification
Specifications in this manual are tentative and subject to change.
Analog Input Pin and External Sensor Equivalent Circuit
=
R0
–
-------------------------------------------------- -
6.0
=
×
–
0.75
VC
10
-------------------
C
Sensor equivalent
circuit
VC
Nov 05, 2008
•
–
–
e
T
12
VIN
=
×
ln
–
--------------------------
C R0
10
•
VIN 1 e
X
--- -
Y
=
--------------------------T
C R0
(
ln
(
6 –
–
VIN
1
----------- -
1024
R
0.1
1
+
+
R
R0
–
–
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
27. A/D Converter
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