ST6225C STMicroelectronics, ST6225C Datasheet - Page 90

• Manufacturer Part Number: ST6225C
• Description: 8 Bit ST6 Microcontroller with 16x8-bitADC 1x8-bit TIMER
• Manufacturer: STMicroelectronics

Specifications of ST6225C

• Clock Sources: crystal/ceramic resonator or RC network, external clock, backup oscillator (LFAO)
• 2 Power Saving Modes: Wait and Stop

ST6215C ST6225C
8-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy
Notes:
1. Negative injection disturbs the analog performance of the device. In particular, it induces leakage currents throughout
2. Data based on characterization results over the whole temperature range, monitored in production.
Figure 73. ADC Accuracy Characteristics
Note: ADC not present on some devices. See device summary on page 1.
90/105
1
Symbol
255
254
253
the device including the analog inputs. To avoid undesirable effects on the analog functions, care must be taken:
- Analog input pins must have a negative injection less than 1mA (assuming that the impedance of the analog voltage
is lower than the specified limits).
- Pure digital pins must have a negative injection less than 1mA. In addition, it is recommended to inject the current as
far as possible from the analog input pins.
|E
|E
|E
7
6
5
4
3
2
1
E
E
0
V
O
G
D
T
L
SSA
|
|
|
Digital Result ADCDR
1
1LSB
Total unadjusted error
Offset error
Gain Error
Differential linearity error
Integral linearity error
E
O
2
IDEAL
3
1)
Parameter
=
1)
4
V
---------------------------------------- -
DDA
5
256
1 LSB
–
V
1)
E
1)
SSA
6
T
IDEAL
1)
E
7
L
(2)
E
D
Conditions
f
253 254 255 256
OSC
(3)
V
DD
=8MHz
=5V
(1)
2)
E
G
V
DDA
Min
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
E
between the actual and the ideal transfer curves.
E
transition and the first ideal one.
E
transition and the last actual one.
E
between actual steps and the ideal one.
E
between any actual transition and the end point
correlation line.
T
O
G
D
L
=Total Unadjusted Error: maximum deviation
=Integral Linearity Error: maximum deviation
=Offset Error: deviation between the first actual
=Gain Error: deviation between the last ideal
=Differential Linearity Error: maximum deviation
V
in
(LSB
-0.31
Typ.
0.72
0.54
1.2
IDEAL
)
±2, fosc>1.2MHz
±4, fosc>32KHz
Max
Unit
LSB