LC87FBL08A Datasheet, PDF (18/28 Pages) Sanyo Semicon Device – 8K-byte FROM and 256-byte RAM integrated 8-bit 1-chip Microcontroller

LC87FBL08A
AD Converter Characteristics at VSS1 = VSS2 = 0V
<12bits AD Converter Mode/Ta = -40°C to +85°C >
Parameter
Symbol
Pin/Remarks
Resolution
Absolute
accuracy
Conversion time
N
ET
TCAD
AN0(P00) to
AN6(P06),
AN8(P70) to
AN11(P73)
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]
2.7 to 5.5
3.0 to 5.5
2.7 to 5.5
4.0 to 5.5
3.0 to 5.5
2.7 to 5.5
2.7 to 5.5
VAIN=VDD
VAIN=VSS
2.7 to 5.5
2.7 to 5.5
min
32
64
134
VSS
-1
Specification
typ
max
unit
12
bit
±16
LSB
±20
115
115
μs
215
VDD
V
1
μA
<8bits AD Converter Mode/Ta = -40°C to +85°C >
Parameter
Symbol
Pin/Remarks
Resolution
Absolute
accuracy
Conversion time
N
ET
TCAD
AN0(P00) to
AN6(P06),
AN8(P70) to
AN11(P73)
Conditions
(Note 6-1)
• See Conversion time calculation
formulas. (Note 6-2)
VDD[V]
2.7 to 5.5
2.7 to 5.5
4.0 to 5.5
3.0 to 5.5
min
20
40
Specification
typ
max
unit
8
bit
±1.5 LSB
90
90
μs
2.7 to 5.5
80
Analog input
voltage range
VAIN
2.7 to 5.5
VSS
Analog port
input current
IAINH
IAINL
VAIN=VDD
VAIN=VSS
2.7 to 5.5
2.7 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
135
VDD
V
1
μA
External
oscillation
(FmCF)
Operating supply
voltage range
(VDD)
4.0V to 5.5V
System division ratio
(SYSDIV)
1/1
Cycle time
(tCYC)
250ns
AD division
ratio
(ADDIV)
1/8
AD conversion time
(TCAD)
12bit AD
8bit AD
34.8μs
21.5μs
CF-12MHz
3.0V to 5.5V
1/1
250ns
1/16
69.5μs
42.8μs
2.7V to 5.5V
1/1
250ns
1/32
138.8μs
85.5μs
4.0V to 5.5V
1/1
375ns
1/8
52.25μs
32.25μs
CF-8MHz
3.0V to 5.5V
1/1
375ns
1/16
104.25μs
64.25μs
2.7V to 5.5V
1/1
375ns
1/32
208.25μs
128.25μs
CF-4MHz
3.0V to 5.5V
2.7V to 5.5V
1/1
750ns
1/8
104.5μs
64.5μs
1/1
750ns
1/16
208.5μs
128.5μs
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.A1955-18/28