M30626SPFP#U5C Renesas Electronics America, M30626SPFP#U5C Datasheet - Page 266

IC M16C/62P MCU ROMLESS 100QFP

M30626SPFP#U5C

Manufacturer Part Number
M30626SPFP#U5C
Description
IC M16C/62P MCU ROMLESS 100QFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/60r
Datasheet

Specifications of M30626SPFP#U5C

Core Processor
M16C/60
Core Size
16-Bit
Speed
24MHz
Connectivity
I²C, IEBus, UART/USART
Peripherals
DMA, WDT
Number Of I /o
50
Program Memory Type
ROMless
Ram Size
31K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 26x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
100-QFP
For Use With
867-1000 - KIT QUICK START RENESAS 62PR0K33062PS001BE - R0K33062P STARTER KITR0K33062PS000BE - KIT EVAL STARTER FOR M16C/62PM3062PT3-CPE-3 - EMULATOR COMPACT M16C/62P/30P
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-

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M16C/62P Group (M16C/62P, M16C/62PT)
Rev.2.41
REJ09B0185-0241
18.2.5
18.2.6
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 18.11 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, 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 18.11 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.
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) 0.1LSB or
less, is approximately 13.9 kΩ. maximum.
Jan 10, 2006
18.2.5 Current Consumption Reducing Function
Output Impedance of Sensor under A/D Conversion
VC is generally
And when t = T,
Hence,
T = 0.3 µs, R = 7.8 kΩ, C = 1.5 pF, X = 0.1, and Y = 1024. Hence,
R0
=
----------------------------------------------------
1.5
R0
×
=
Page 249 of 390
0.3
10 12
VC
-------------------
C
×
VC
10 6 –
e
T
=
ln
--------------------------
C R0
VIN 1 e
ln
X
--- -
Y
--------------------------T
C R0
=
(
(
----------- -
1024
VIN
0.1
1
R
1
+
+
R
R
)
7.8
T
X
--- - VIN
Y
)
=
×10
=
--------------------------
C R0
ln
(
X
--- -
Y
X
--- -
Y
3
1
=
=
+
VIN 1
R
13.9
)
t
×10
3
X
--- -
Y
18. A/D Converter

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