PIC16F876A-E/SS Microchip Technology, PIC16F876A-E/SS Datasheet - Page 444

• Manufacturer Part Number: PIC16F876A-E/SS
• Description: 28 PIN, 14KB ENH FLASH, 368 RAM, 22 I/O,
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F876A-E/SS

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SSOP
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 368 B
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
24.1
DS31024A-page 24-2
AN15
AN14
AN13
AN12
AN11
(SLPCON<0>)
AN7
AN6
AN5
AN4
AN3
AN2
AN1
AN0
Note 3
ADOFF
Bandgap Ref.
OSC1
Oscillator
AN0
Internal
SREFLO
CDAC
Introduction
SREFHI
C
(Configuration Bit)
~2.5uA~5uA~10uA~20uA
FOSC
0
1
The components required to create a Slope A/D converter include:
• Precision comparator
• 4-bit programmable current source
• 16-channel analog MUX
• 16-bit timer with capture register
This section will discuss using these components for a Slope A/D.
Each analog input channel is multiplexed to a single analog input source to be converted by
means of a slope conversion method (using a single precision comparator). The programmable
current source feeds an external capacitor to generate the ramp voltage used in the conversion.
Figure 24-1: Slope A/D Block Diagram
ADCON0<7:4>
~100
14
12
11
15
13
10
9
8
7
6
5
4
3
2
1
0
ADCON1<7:4>
4-Bit Current DAC (Note 1)
(ADCON0<2>)
Analog
MUX
~ 1 k
4
AMUXOE
ADRST (ADCON0<1>)
ADOFF
ADRST
Note 2
ADOFF
Slope A/D
Capture Interrupt (ADCIF)
Clock
Logic
Stop
Slope A/D Capture
Note 1: All current sources are disabled if ADRST = ‘1’
ADTMRH
ADCAPH
2: Approximately 3.5 microsecond time constant
3: Dependent on A/D resolution and input voltage
range (see
ADTMRL
ADCAPL
Table
24-2)
Overflow
1997 Microchip Technology Inc.
Timer
Internal
Data
Bus