
R8C/36T-A Group
28. Electrical Characteristics
Under development Preliminary document
Specifications in this document are tentative and subject to change.
R01UH0240EJ0010 Rev.0.10
Page 670 of 728
Aug 05, 2011
28.3
Peripheral Function Characteristics
Notes:
1. If the CPU and the flash memory stop, the A/D conversion result will be undefined.
2. When the analog input voltage exceeds the reference voltage, the A/D conversion result will be 3FFh in 10-bit mode and FFh
in 8-bit mode.
Note:
1. When the digital filter is not selected.
Table 28.3
A/D Converter Characteristics
(Vcc/AVcc = Vref = 2.2 V to 5.5 V, Vss = 0 V, Topr =
20°C to 85°C (N version)/
40°C to 85°C (D version), unless otherwise specified)
Symbol
Parameter
Conditions
Standard
Unit
Min.
Typ.
Max.
―
Resolution
Vref = AVcc
――
10
Bit
―
Absolute
accuracy
10-bit mode
Vref = AVcc = 5.0 V AN0 to AN11 input
――
±3
LSB
Vref = AVcc = 3.3 V AN0 to AN11 input
――
±5
LSB
Vref = AVcc = 3.0 V AN0 to AN11 input
――
±5
LSB
Vref = AVcc = 2.2 V AN0 to AN11 input
――
±5
LSB
8-bit mode
Vref = AVcc = 5.0 V AN0 to AN11 input
――
±2
LSB
Vref = AVcc = 3.3 V AN0 to AN11 input
――
±2
LSB
Vref = AVcc = 3.0 V AN0 to AN11 input
――
±2
LSB
Vref = AVcc = 2.2 V AN0 to AN11 input
――
±2
LSB
AD
A/D conversion clock
4.0 V
2
―
20
MHz
3.2 V
2
―
16
MHz
2.7 V
2
―
10
MHz
2.2 V
2
―
5MHz
―
Tolerance level impedance
―
3
―
k
Ivref
Vref current
Vcc = 5 V, XIN = f1 = fAD = 20 MHz
―
45
―μA
tCONV
Conversion time
10-bit mode
Vref = AVcc = 5.0 V,
AD = 20 MHz
2.2
――
μs
8-bit mode
Vref = AVcc = 5.0 V,
AD = 20 MHz
2.2
――
μs
tSAMP
Sampling time
AD = 20 MHz
0.8
――
μs
Vref
Reference voltage
2.2
―
AVcc
V
VIA
0
―
Vref
V
On-chip reference voltage
1.19
1.34
1.49
V
Table 28.4
Comparator B Characteristics
(Vcc/AVcc = 2.2 V to 5.5 V, Topr =
20°C to 85°C (N version)/40°C to 85°C (D version),
unless otherwise specified)
Symbol
Parameter
Conditions
Standard
Unit
Min.
Typ.
Max.
Vref
IVREF1, IVREF3 input reference
voltage
0
―
Vcc
1.4
V
VI
IVCMP1, IVCMP3 input voltage
0.3
―
Vcc
+ 0.3
V
―
Offset
―
5
100
mV
td
Comparator output delay time
(1)VI = Vref ±100 mV
―
0.1
―μs
ICMP
Comparator operating current
Vcc = 5.0 V
―
17.5
―μA