ST7263BK1 STMicroelectronics, ST7263BK1 Datasheet - Page 126

• Manufacturer Part Number: ST7263BK1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 32K FLASH/ROM, DFU CAPABILITY, 8-BIT ADC, WDG, TIMER, SCI and I2C
• Manufacturer: STMicroelectronics

Specifications of ST7263BK1

• 4, 8, 16 Or 32 Kbytes Program Memory: high density Flash (HDFlash), FastROM or ROM with Read-Out and Write protection

On-chip peripherals
126/186
Figure 50. ADC block diagram
Digital A/D conversion result
The conversion is monotonic, meaning that the result never decreases if the analog input
does not and never increases if the analog input does not.
If the input voltage (V
the conversion result in the DR register is FFh (full scale) without overflow indication.
If input voltage (V
conversion result in the DR register is 00h.
The A/D converter is linear and the digital result of the conversion is stored in the ADCDR
register. The accuracy of the conversion is described in the parametric section.
R
is too high, this will result in a loss of accuracy due to leakage and sampling not being
completed in the allotted time.
A/D conversion phases
The A/D conversion is based on two conversion phases as shown in
●
●
While the ADC is on, these two phases are continuously repeated.
At the end of each conversion, the sample capacitor is kept loaded with the previous
measurement load. The advantage of this behavior is that it minimizes the current
consumption on the analog pin in case of single input channel measurement.
AIN
Sample capacitor loading [duration: t
During this phase, the V
sample capacitor.
A/D conversion [duration: t
During this phase, the A/D conversion is computed (8 successive approximations
cycles) and the C
the optimum analog to digital conversion accuracy.
is the maximum recommended impedance for an analog input signal. If the impedance
AIN0
AIN1
AINx
AIN
COCO
) is lower than or equal to V
AIN
ADC
ANALOG
) is greater than or equal to V
MUX
0
sample capacitor is disconnected from the analog input pin to get
ADON
AIN
4
Doc ID 7516 Rev 8
R
CONV
f
CPU
input voltage to be measured is loaded into the C
ADC
ADCDR
0
CH3
]
CH2
LOAD
D7
HOLD CONTROL
CH1
DIV 4
D6
]
SSA
CH0
C
ADC
D5
(low-level voltage reference) then the
DDA
ADCCSR
D4
(high-level voltage reference) then
ANALOG TO DIGITAL
D3
f
ADC
CONVERTER
D2
D1
Figure
D0
51:
ST7263Bxx
ADC