M30280FAHP#U5B Renesas Electronics America, M30280FAHP#U5B Datasheet - Page 271

• Manufacturer Part Number: M30280FAHP#U5B
• Description: IC M16C/28 MCU FLASH 96K 80LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/Tiny/28r

Specifications of M30280FAHP#U5B

• Core Size: 16-Bit
• Program Memory Size: 96KB (96K x 8)
• Core Processor: M16C/60
• Speed: 20MHz
• Connectivity: I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, POR, PWM, Voltage Detect, WDT
• Number Of I /o: 71
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 80-LQFP
• Controller Family/series: M16C
• No. Of I/o's: 71
• Ram Memory Size: 8KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• Digital Ic Case Style: LQFP
• Embedded Interface Type: I2C, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: R0K330290S000BE - KIT EVAL STARTER FOR M16C/29M30290T2-CPE - EMULATOR COMPACT M16C/26A/28/29M30290T2-CPE-HP - EMULATOR COMPACT FOR M16C/TINY
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

M
R
R
15.5 Output Impedance of Sensor under A/D Conversion
1
e
E
Figure 15.29 Analog Input Pin and External Sensor Equivalent Circuit
. v
6
J
0
C
2
9
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 15.29 has to be
completed within a specified period of time. T (sampling time) as the specified time. Let output imped-
ance 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 15.29 shows analog input pin and externalsensor equivalent circuit. When the difference be-
tween 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 timer T. (0.1/1024) means that A/D precision drop due to insufficient
capacitor chage 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) = 10MHz, T=0.3 s in the A/D conversion
mode with sample & hold. Output inpedance R0 for sufficiently charging capacitor C within time T is
determined as follows.
Thus, the allowable output impedance of the sensor circuit capable of thoroughly driving the A/D con-
verter turns out of be approximately 13.9k .
2 /
0 .
B
0
8
0
0
G
4
J
7
a
o r
VC is generally VC = VIN{1-e
And when t = T,
Hence,
T = 0.3 s, R = 7.8k , C = 1.5pF, X = 0.1, and Y = 1024. Hence,
R0 = -
0 -
. n
u
2
p
3
0
, 1
0
(
NOTES:
M
2
1
0
Sensor equivalent
circuit
1. Reference value
0
6
V
1.5X10
7
C
IN
2 /
R0 = -
page 249
, 8
0.3X10
-
M
-12
R
1
C(R0+R)
0
6
•ln
e
VC=VIN-
C
C•ln
1
2 /
c(R0+R)
-6
f o
1024
0.1
8
3
) B
T
8
Microcomputer
5
T = ln
R (7.8k )
1
Y
X
C (1.5pF)
X
Y
T
c(R0+R)
=
- 7.8 X 10
- R
(1)
Y
X
(1)
VIN=VIN(1-
1
X
Y
t
}
3
V
C
13.9 X 10
Sampling time
Sample-and-hold function enabled:
Sample-and-hold function disabled:
X
Y
)
3
3
AD
2
AD
15. A/D Converter