PIC16F688T-I/SL Microchip Technology, PIC16F688T-I/SL Datasheet - Page 364

• Manufacturer Part Number: PIC16F688T-I/SL
• Description: IC MCU PIC FLASH 4KX14 14SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F688T-I/SL

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Controller Family/series: PIC16F
• No. Of I/o's: 12
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 256Byte
• Cpu Speed: 20MHz
• No. Of Timers: 2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT14SO-1 - SOCKET TRANSITION 14SOIC 150/208AC162061 - HEADER INTRFC MPLAB ICD2 20PINAC162056 - HEADER INTERFACE ICD2 16F688
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: PIC16F688T-I/SL; PIC16F688T-I/SLTR

PICmicro MID-RANGE MCU FAMILY
19.3
DS31019A-page 19-4
Configuring the Voltage Reference
The Voltage Reference can output 16 distinct voltage levels for each range.
The equations used to calculate the output of the Voltage Reference are as follows:
The settling time of the Voltage Reference must be considered when changing the V
Example 19-1
of 1.25V with V
Generally the V
load into VR3:VR0.
some error since VR3:VR0 can only be an integer, and the V
so that the result is not greater then 15.
Equation 19-1:
When VRR = 1
When VRR = 0
if VRR = 1: V
if VRR = 0: V
shows an example of how to configure the Voltage Reference for an output voltage
DD
REF
REF
REF
VR3:VR0 =
VR3:VR0 =
Calculating VR3:VR0
= 5.0V.
and V
Equation 19-1
= (VR3:VR0/24) x V
= (V
DD
DD
x 1/4) + (VR3:VR0/32) x V
of the system will be known and you need to determine the value to
V
V
V
REF
REF
DD
shows how to calculate the VR3:VR0 value. There will be
V
- V
DD
X 24
DD
DD
/4
X 32
DD
REF
and V
1997 Microchip Technology Inc.
DD
levels must be chosen
REF
output.