ENA1622B Datasheet, PDF (16/25 Pages) ON Semiconductor – 8-bit 1-chip Microcontroller

LC87F2R04A
AD Converter Characteristics at Ta = -40°C to +85°C, VSS1 = 0V
12bits AD Converter Mode
Parameter
Symbol
Resolution
Absolute
accuracy
Conversion time
N
ET
TCAD
Pin/Remarks
AN0(P00) to
AN6(P06),
AN8(P70)
Analog input
voltage range
Analog port
input current
VAIN
IAINH
IAINL
Conditions
(Note 6-1)
• See Conversion time calculation
formulas.
(Note 6-2)
VDD[V]
2.4 to 5.5
2.7 to 5.5
2.4 to 5.5
4.0 to 5.5
2.7 to 5.5
2.4 to 5.5
2.4 to 5.5
VAIN=VDD
VAIN=VSS
2.4 to 5.5
2.4 to 5.5
min
32
64
410
VSS
-1
Specification
typ
max
unit
12
bit
±16
LSB
±20
115
115
μs
425
VDD
V
1
μA
8bits AD Converter Mode
Parameter
Resolution
Absolute
accuracy
Symbol
N
ET
Pin/Remarks
AN0(P00) to
AN6(P06)
AN8(P70)
Conditions
(Note 6-1)
VDD[V]
min
2.4 to 5.5
2.4 to 5.5
Specification
typ
max
unit
8
bit
±1.5 LSB
Conversion time TCAD
• See Conversion time calculation 4.0 to 5.5
20
formulas.
(Note 6-2)
2.7 to 5.5
40
2.4 to 5.5
250
90
90
μs
265
Analog input
voltage range
VAIN
2.4 to 5.5
VSS
VDD
V
Analog port
IAINH
VAIN=VDD
2.4 to 5.5
input current
IAINL
VAIN=VSS
2.4 to 5.5
-1
Conversion time calculation formulas:
12bits AD Converter Mode: TCAD(Conversion time) = ((52/(AD division ratio))+2)×(1/3)×tCYC
8bits AD Converter Mode: TCAD(Conversion time) = ((32/(AD division ratio))+2)× (1/3)×tCYC
1
μA
External
oscillation
(FmCF)
Operating supply
voltage range
(VDD)
System division ratio
(SYSDIV)
Cycle time
(tCYC)
AD division
ratio
(ADDIV)
AD conversion time
(TCAD)
12bit AD
8bit AD
CF-12MHz
4.0V to 5.5V
3.0V to 5.5V
1/1
250ns
1/8
34.8μs
21.5μs
1/1
250ns
1/16
69.5μs
42.8μs
CF-10MHz
4.0V to 5.5V
3.0V to 5.5V
1/1
300ns
1/8
41.8μs
25.8μs
1/1
300ns
1/16
83.4μs
51.4μs
CF-4MHz
3.0V to 5.5V
2.4V to 5.5V
1/1
750ns
1/8
104.5μs
64.5μs
1/1
750ns
1/32
416.5μs
256.5μs
Note 6-1: The quantization error (±1/2LSB) must be excluded from the absolute accuracy. The absolute accuracy must
be measured in the microcontroller's state in which no I/O operations occur at the pins adjacent to the analog
input channel.
Note 6-2: The conversion time refers to the period from the time an instruction for starting a conversion process till the
time the conversion results register(s) are loaded with a complete digital conversion value corresponding to
the analog input value.
The conversion time is 2 times the normal-time conversion time when:
• The first AD conversion is performed in the 12-bit AD conversion mode after a system reset.
• The first AD conversion is performed after the AD conversion mode is switched from 8-bit to 12-bit
conversion mode.
No.A1622-16/25