PIC16F628AT-E/SS Microchip Technology, PIC16F628AT-E/SS Datasheet - Page 69
![IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SSOP,20PIN,PLASTIC](/photos/6/58/65895/150-20-ssop_sml.jpg)
PIC16F628AT-E/SS
Manufacturer Part Number
PIC16F628AT-E/SS
Description
IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SSOP,20PIN,PLASTIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Specifications of PIC16F628AT-E/SS
Rohs Compliant
YES
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
3.5KB (2K x 14)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
224 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
20-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
I3DBF648 - BOARD DAUGHTER ICEPIC3AC162053 - HEADER INTERFACE ICD,ICD2 18DIP
Data Converters
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 69 of 180
- Download datasheet (3Mb)
11.0
The Voltage Reference module consists of a 16-tap
resistor ladder network that provides a selectable volt-
age reference. The resistor ladder is segmented to pro-
vide two ranges of V
function to conserve power when the reference is not
being used. The VRCON register controls the opera-
tion of the reference as shown in Figure 11-1. The
block diagram is given in Figure 11-1.
11.1
The Voltage Reference module can output 16 distinct
voltage levels for each range.
REGISTER 11-1:
© 2009 Microchip Technology Inc.
VOLTAGE REFERENCE
MODULE
Voltage Reference Configuration
bit 7
bit 6
bit 5
bit 4
bit 3-0
REF
VRCON – VOLTAGE REFERENCE CONTROL REGISTER (ADDRESS: 9Fh)
bit 7
VREN: V
1 = V
0 = V
VROE: V
1 = V
0 = V
VRR: V
1 = Low range
0 = High range
Unimplemented: Read as ‘0’
VR<3:0>: V
When VRR = 1: V
When VRR = 0: V
Legend:
R = Readable bit
-n = Value at POR
values and has a power-down
R/W-0
VREN
REF
REF
REF
REF
REF
REF
REF
circuit powered on
circuit powered down, no I
is output on RA2 pin
is disconnected from RA2 pin
Range Selection bit
REF
Enable bit
Output Enable bit
R/W-0
VROE
Value Selection bits 0 ≤ VR <3:0> ≤ 15
REF
REF
= (VR<3:0>/ 24) * V
= 1/4 * V
R/W-0
VRR
W = Writable bit
‘1’ = Bit is set
DD
PIC16F627A/628A/648A
+ (VR<3:0>/ 32) * V
DD
U-0
—
drain
The equations used to calculate the output of the
Voltage Reference module are as follows:
The setting time of the Voltage Reference module must
be considered when changing the V
(Table 17-3). Example 11-1 demonstrates how voltage
reference is configured for an output voltage of 1.25V
with V
DD
if VRR = 1:
if VRR = 0:
DD
V
= 5.0V.
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
REF
VR3
DD
=
V
REF
⎛
⎝
V
DD
=
×
R/W-0
V
---------------------- -
VR2
R
1
-- -
4
⎞
⎠
<3:0>
24
+
V
---------------------- -
R
x = Bit is unknown
<3:0>
×
32
R/W-0
V
VR1
REF
DD
DS40044G-page 69
×
output
V
DD
R/W-0
VR0
bit 0
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