M30624FGAFP#U3 Renesas Electronics America, M30624FGAFP#U3 Datasheet - Page 459

• Manufacturer Part Number: M30624FGAFP#U3
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/60r

Specifications of M30624FGAFP#U3

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 20K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• For Use With: 867-1000 - KIT QUICK START RENESAS 62PM3062PT3-CPE-3 - EMULATOR COMPACT M16C/62P/30P
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

A-D Converter
2-140
Figure 2.7.29 A circuit equivalent to the A-D conversion terminal
2.7.15 Sensor’s Output Impedance under A-D Conversion
To carry out A-D conversion properly, charging the internal capacitor C shown in Figure 2.7.29 has to be
completed within a specified period of time. With T as the specified time, time T is the time that switches
SW2 and SW3 are connected to O in Figure 2.7.28. 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).
With the model shown in Figure 2.7.29 as an example, when the difference between V
0.1LSB, we find impedance R0 when voltage between pins V
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(X
impedance 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 to be approximately 3.0 k . Tables 2.7.14 and 2.7.15 show output impedance values
based on the LSB values.
Vc is generally V
And when t = T,
Hence, R0 = –
T = 0.3 s, R = 7.8 k , C = 3 pF, X = 0.1, and Y = 1024 . Hence,
R0 = –
3.0 X 10
IN
Sensor-equivalent circuit
0.3 X 10
) = 10 MHz, T = 0.3 s in the A-D conversion mode with sample & hold. Output
C
C • ln
–12
= V
V
e
–
• ln
C
–
V
=V
T
IN
C (R0 +R)
IN
C (R0 + R)
-6
{1 – e
IN
Y
X
1024
T
0.1
–
T
– R
Y
X
–
R
=
=ln
C (R0 + R)
V
0
–7.8 X10
IN
Y
=V
X
t
Y
X
IN
(1 –
3
R (7.8k )
C (3.0pF)
}
Microprocessor's inside
3.0 X 10
Y
X
)
C
3
changes from 0 to V
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
V
C
IN
M16C / 62A Group
IN
Mitsubishi microcomputers
-(0.1/1024) V
and V
C
becomes
IN
in