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ST7LITEUS2, ST7LITEUS5
Electrical characteristics
115/136
Figure 62.
RESET pin protection
when LVD is disabled
12.10 ADC
characteristics
Subject to general operating condition for V
DD
, f
OSC
, and T
A
unless otherwise specified.
0.01
μ
F
EXTERNAL
RESET
CIRCUIT
USER
Required
ST7XXX
PULSE
GENERATOR
Filter
R
ON
V
DD
INTERNAL
RESET
WATCHDOG
ILLEGAL OPCODE
5)
Table 66.
10-bit ADC characteristics
Symbol
Parameter
Conditions
Min
Typ
(1)
1.
Unless otherwise specified, typical data are based on T
A
=25°C and V
DD
-V
SS
=5 V. They are given only as
design guidelines and are not tested.
Max
Unit
f
ADC
ADC clock frequency
(2)
2.
The maximum ADC clock frequency allowed within V
DD
= 2.4 to 2.7 V operating range is 1 MHz.
4
MHz
V
AIN
Conversion voltage range
(3)
3.
When V
DDA
and V
SSA
pins are not available on the pinout, the ADC refers to V
DD
and V
SS.
V
SSA
V
DDA
V
R
AIN
External input resistor
V
DD
= 5 V, f
ADC
=4 MHz
8
(4)
4.
Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than
10k
Ω
). Data based on characterization results, not tested in production.
k
Ω
V
DD
= 3.3 V,
f
ADC
=4 MHz
2.7 V
≤
V
DD
≤
5.5 V,
f
ADC
=2 MHz
2.4 V
≤
V
DD
≤
2.7 V,
f
ADC
=1 MHz
C
ADC
Internal sample and hold
capacitor
3
pF
t
STAB
Stabilization time after ADC
enable
f
CPU
=8 MHz,
f
ADC
=4 MHz
0
(5)
5.
The stabilization time of the A/D converter is masked by the first t
LOAD
. The first conversion after the
enable is then always valid.
μ
s
t
ADC
Conversion time
(Hold)
3.5
- Sample capacitor loading
time
- Hold conversion time
4
10
1/f
ADC
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