ST72C334N2B6 STMicroelectronics, ST72C334N2B6 Datasheet - Page 95

• Manufacturer Part Number: ST72C334N2B6
• Description: Microcontrollers (MCU) Flash 8K SPI/SCI
• Manufacturer: STMicroelectronics

Specifications of ST72C334N2B6

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 384 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 44
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: SDIP-56
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: No

6.7 8-BIT A/D CONVERTER (ADC)
6.7.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 8-bit, successive approximation con-
verter with internal sample and hold circuitry. This
peripheral has up to 16 multiplexed analog input
channels (refer to device pin out description) that
allow the peripheral to convert the analog voltage
levels from up to 16 different sources.
The result of the conversion is stored in a 8-bit
Data Register. The A/D converter is controlled
through a Control/Status Register.
6.7.2 Main Features
The block diagram is shown in Figure 56.
Figure 56. ADC Block Diagram
8-bit conversion
Up to 16 channels with multiplexed input
Linear successive approximation
Data register (DR) which contains the results
Conversion complete status flag
On/off bit (to reduce consumption)
AIN0
AINx
AIN1
COCO
ANALOG
MUX
0
ADON
4
R
f
CPU
ADC
ADCDR
0
CH3
C
SAMPLE
CH2
D7
HOLD CONTROL
6.7.3 Functional Description
6.7.3.1 Analog Power Supply
V
ence voltage pins. In some devices (refer to device
pin out description) they are internally connected
to the V
Conversion accuracy may therefore be impacted
by voltage drops and noise in the event of heavily
loaded or badly decoupled power supply lines.
Figure 55. Recommended Ext. Connections
CH1
DDA
DIV 2
D6
CH0
and V
ST72334J/N, ST72314J/N, ST72124J
DD
V
D5
V
DD
AIN
and V
ADCCSR
SSA
D4
are the high and low level refer-
R
SS
AIN
ANALOG TO DIGITAL
D3
pins.
f
ADC
CONVERTER
D2
0.1pF
D1
V
V
Px.x/AINx
D0
DDA
SSA
ST7
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