ST72F621L4M1 STMicroelectronics, ST72F621L4M1 Datasheet - Page 122

• Manufacturer Part Number: ST72F621L4M1
• Description: IC MCU 8BIT LS 16K 34-SOIC
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F621L4M1

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 34-SOIC (7.5mm Width)
• Processor Series: ST72F6x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: SCI, SPI, USB
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 2
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• On-chip Adc: 10 bit
• For Use With: 497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: In Transition
• Other names: 497-2112-5

ADC CHARACTERISTICS (Cont’d)
12.12.1 ADC Accuracy
Table 27. f
Notes:
1. Not tested in production, guaranteed by characterization. All accuracy measurements are taken with the MCU in WAIT
mode (no I/O switching) and when adequate low-pass filtering is present (0.1 µF capacitor between V
V
based on board layout and the type of CPU activity.
2. ADC Accuracy vs. Negative Injection Current:
Injecting negative current on any of the analog input pins significantly reduces the accuracy of the conversion being per-
formed on another analog input.
For I
for each 10KΩ increase of the external analog source impedance. It is recommended to add a Schottky diode (pin to
ground) to analog pins which may potentially inject negative current. Any positive injection current within the limits spec-
ified for I
122/139
Symbol
SSA
INJ-
|E
|E
|E
|E
|E
). Outside these conditions, a degree of microcontroller noise may result, causing accuracy errors which will vary
O
G
T
D
L
=0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of 4 LSB
|
|
|
|
|
INJ(PIN)
CPU
Total unadjusted error
Offset error
Gain Error
Differential linearity error
Integral linearity error
and ΣI
=8 MHz, f
INJ(PIN)
Parameter
ADC
in
Section 12.8
=4 MHz R
AIN
does not affect the ADC accuracy.
< 10
kΩ
V
DD
Doc ID 6996 Rev 5
2)
= 4V-5.5V
Conditions
Typ
0.7
1.3
2.9
3
1
Max
2
2
2
5
1)
DD
/V
DDA
Unit
and V
LSB
SS
/