PIC18F87K90-I/PTRSL Microchip Technology, PIC18F87K90-I/PTRSL Datasheet - Page 371

• Manufacturer Part Number: PIC18F87K90-I/PTRSL
• Description: MCU PIC 128K FLASH XLP 80TQFP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F87K90-I/PTRSL

• Core Size: 8-Bit
• Program Memory Size: 128KB (64K x 16)
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TFQFP
• Controller Family/series: PIC18
• Eeprom Memory Size: 1024Byte
• Ram Memory Size: 4096Byte
• Cpu Speed: 16MIPS
• No. Of Timers: 11
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 64 MHz
• Number Of Timers: 11
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 24 Channel
• A/d Bit Size: 12 bit
• A/d Channels Available: 24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

23.0
The Analog-to-Digital (A/D) Converter module in the
PIC18F87K90 family of devices has 16 inputs for the
64-pin devices and 24 inputs for the 80-pin devices.
This module allows conversion of an analog input
signal to a corresponding signed 12-bit digital number.
The module has these registers:
• A/D Control Register 0 (ADCON0)
• A/D Control Register 1 (ADCON1)
• A/D Control Register 2 (ADCON2)
• A/D Port Configuration Register 0 (ANCON0)
• A/D Port Configuration Register 1 (ANCON1)
• A/D Port Configuration Register 2 (ANCON2)
• ADRESH (the upper A/D Results register)
• ADRESL (the lower A/D Results register)
The ADCON0 register, shown in Register 23-1, con-
trols the operation of the A/D module. The ADCON1
register, shown in Register 23-2, configures the voltage
reference and special trigger selection. The ADCON2
register, shown in Register 23-3, configures the A/D
clock source and programmed acquisition time and
justification.
 2010 Microchip Technology Inc.
12-BIT ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
Preliminary
PIC18F87K90 FAMILY
23.1
The converter in PIC18F87K90 family devices is
implemented as a differential A/D where the differential
voltage between two channels is measured and
converted to digital values (see Figure 23-1).
The converter also can be configured to measure a
voltage from a single input by clearing the CHSN bits
(ADCON1<2:0>). With this configuration, the negative
channel input is connected internally to AV
Figure 23-2).
FIGURE 23-1:
Differential conversion feeds the two input channels to
a unity gain differential amplifier. The positive channel
input is selected using the CHS bits (ADCON0<6:2>)
and the negative channel input is selected using the
CHSN bits (ADCON1<2:0>).
The output from the amplifier is fed to the A/D convert,
as shown in Figure 23-1. The 12-bit result is available
on the ADRESH and ADRESL registers. There is also
a sign bit, along with the 12-bit result, indicating if the
result is a positive or negative value.
FIGURE 23-2:
In the Single Channel Measurement mode, the
negative input is connected to A
CHSN bits (ADCON1<2:0>).
Positive input
CHS<4:0>
CHSN<2:0>
= 000
Positive input
CHS<4:0>
Negative input
CHSN<2:0>
Differential A/D Converter
AV
SS
+
–
+
–
DIFFERENTIAL CHANNEL
MEASUREMENT
SINGLE CHANNEL
MEASUREMENT
VSS
DS39957B-page 371
by clearing the
ADC
ADC
SS
(see