M306N5FCTFP Renesas Electronics America, M306N5FCTFP Datasheet - Page 225
![IC M16C MCU FLASH 100QFP](/photos/12/21/122166/qfp100-g1_pkg_sml.jpg)
M306N5FCTFP
Manufacturer Part Number
M306N5FCTFP
Description
IC M16C MCU FLASH 100QFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/6Nr
Datasheets
1.M30622SAFPU5.pdf
(308 pages)
2.M306N5FCTFPUK.pdf
(90 pages)
3.M306N5FCTFPU0.pdf
(408 pages)
Specifications of M306N5FCTFP
Core Processor
M16C/60
Core Size
16-Bit
Speed
20MHz
Connectivity
CAN, I²C, IEBus, SIO, UART/USART
Peripherals
DMA, WDT
Number Of I /o
87
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
5K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 26x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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M16C/6N Group (M16C/6N5)
Rev.2.40
REJ09B0011-0240
16.2.5 Current Consumption Reducing Function
16.2.6 Output Impedance of Sensor under A/D Conversion
When not using the A/D converter, its resistor ladder and reference voltage input pin (VREF) can be
separated using the VCUT bit in the ADCON1 register. When separated, no current will flow from the
VREF pin into the resistor ladder, helping to reduce the power consumption of the chip.
To use the A/D converter, set the VCUT bit to 1 (VREF connected) and then set the ADST bit in the
ADCON0 register to 1 (A/D conversion start). The VCUT and ADST bits cannot be set to 1 at the same time.
Nor can the VCUT bit be set to 0 (VREF unconnected) during A/D conversion.
Note that this does not affect VREF for the D/A converter (irrelevant).
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 16.10 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 MCU be R, precision (error) of the A/D converter
be X, and the resolution of A/D converter be Y (Y is 1024 in 10-bit mode, and 256 in 8-bit mode).
Figure 16.10 shows the 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 10-bit mode.
Actual error however is the value of absolute precision added to 0.1 LSB.
When f(φAD) = 10 MHz, T = 0.3 µs in the A/D conversion mode with sample & hold. 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) 0.1
LSB or less, is approximately 13.9 kΩ. maximum.
Apr 14, 2006
VC is generally VC = VIN {1 – e
And when t = T,
Hence, R0 = –
T = 0.3 µs, R = 7.8 kΩ, C = 1.5 pF, X = 0.1, and Y = 1024. Hence,
R0 = –
1.5 ✕ 10
page 203 of 372
0.3 ✕ 10
C • ln
–12
VC=VIN –
e
–
• ln
–
C (R0 + R)
T
-6
C (R0 + R)
X
Y
1024
1
0.1
1
– R
Y
X
–
T = ln
–7.8 ✕10
T
VIN = VIN(1 –
C (R0 + R)
=
1
Y
X
X
Y
3
t
= 13.9 ✕ 10
}
X
Y
)
3
16. A/D Converter
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