R5F21132FP#U0 Renesas Electronics America, R5F21132FP#U0 Datasheet - Page 148
R5F21132FP#U0
Manufacturer Part Number
R5F21132FP#U0
Description
IC R8C MCU FLASH 8K 32LQFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/R8C/Tiny/13r
Datasheets
1.R5F211A2SPU0.pdf
(300 pages)
2.R5F21132FPU0.pdf
(33 pages)
3.R5F21132FPU0.pdf
(226 pages)
Specifications of R5F21132FP#U0
Core Processor
R8C
Core Size
16-Bit
Speed
20MHz
Connectivity
SIO, UART/USART
Peripherals
LED, POR, Voltage Detect, WDT
Number Of I /o
22
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
32-LQFP
For Use With
R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Manufacturer
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Price
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R8C/13 Group
Rev.1.20
REJ09B0111-0120
14.7 Output Impedance of Sensor under A/D Conversion
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 14.11 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, microcomputer’s internal resistance be R, precision
(error) of the A/D converter be X, and the A/D converter’s resolution be Y (Y is 1024 in the 10-bit mode,
and 256 in the 8-bit mode).
Figure 14.11 shows analog input pin and external sensor equivalent circuit. When the difference
between VIN and VC becomes 0.1 LSB, 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 0.1 LSB at time of A/D conversion in the 10-bit mode. Actual
error however is the value of absolute precision added to 0.1 LSB. When f(X
in the A/D conversion mode with sample & hold. Output impedance R0 for sufficiently charging capaci-
tor C within time T is determined as follows.
Thus, the allowable output impedance of the sensor circuit capable of thoroughly driving the A/D
converter turns out to be approximately 7.3 k .
Jan 27, 2006
R0 = –
VC is generally VC = VIN {1 – e
And when t = T,
Hence, R0 = –
T = 0.25 s, R = 2.8 k , C = 1.5 pF, X = 0.1, and Y = 1024 . Hence,
6.0 X 10
page 135 of 205
0.25 X 10
e
–
C • ln
–12
–
VC=VIN –
C (R0 +R)
• ln
C (R0 + R)
T
1
–6
1
X
Y
1024
0.1
– R
T
Y
X
T = ln
–
– 2.8 X 10
=
C (R0 + R)
VIN = VIN(1 –
1
Y
X
Y
X
14.7 Output Impedance of Sensor under A/D Conversion
3
t
}
7.3 X 10
Y
X
)
3
IN
) = 10 MHz, T = 0.25 µs
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