ST7232AK2 STMicroelectronics, ST7232AK2 Datasheet - Page 137

• Manufacturer Part Number: ST7232AK2
• Description: 8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE
• Manufacturer: STMicroelectronics

Specifications of ST7232AK2

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and bypass for external clock
• Four Power Saving Modes: Halt, Active-Halt, Wait and Slow
• Main Clock Controller With: Real time base, Beep and Clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, PWM and pulse generator modes

12.12 10-BIT ADC CHARACTERISTICS
Subject to general operating conditions for V
Notes:
1. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10kΩ). Data
based on characterization results, not tested in production.
2.injecting negative current on any of the analog input pins significantly reduces the accuracy of any conversion being
performed on any analog input. Analog pins can be protected against negative injection by adding a Schottky diode (pin
to ground). Injecting negative current on digital input pins degrades ADC accuracy especially if performed on a pin close
to the analog input pins. Any positive injection current within the limits specified for I
does not affect the ADC accuracy.
Symbol
V
C
R
C
f
V
t
t
f
AREF
ADC
ADC
ADC
I
AIN
ADC
lkg
AIN
AIN
AIN
ADC clock frequency
Analog reference voltage
Conversion voltage range
Positive input leakage current for analog
input
External input impedance
External capacitor on analog input
Variation freq. of analog input signal
Internal sample and hold capacitor
Conversion time (Sample+Hold)
f
- No of sample capacitor loading cycles
- No. of Hold conversion cycles
CPU
=8MHz, SPEED=0 f
2)
Parameter
ADC
1)
=2MHz
DD
0.7*V
-40°C≤T
+85°C<T
, f
CPU
DD
Conditions
, and T
A
≤V
A
≤+85°C
≤+125°C
AREF
A
≤V
unless otherwise specified.
DD
V
Min
0.4
3.8
SSA
INJ(PIN)
and ΣI
Typ
12
7.5
11
4
INJ(PIN)
Figure 79
Figure 80
V
±250
Max
see
and
V
AREF
±1
2
in
DD
Section 12.8
ST7232A
137/157
1/f
Unit
MHz
nA
µA
kΩ
pF
Hz
pF
µs
V
ADC
1