PIC16F628AT-E/SS Microchip Technology, PIC16F628AT-E/SS Datasheet - Page 70

• 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

PIC16F627A/628A/648A
FIGURE 11-1:
EXAMPLE 11-1:
11.2
The full range of V
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 11-1) keep V
The Voltage Reference module is V
therefore, the V
V
erence module can be found in Table 17-3.
11.3
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time out, the contents of
the VRCON register are not affected. To minimize
current consumption in Sleep mode, the Voltage
Reference module should be disabled.
11.4
A device Reset disables the Voltage Reference module
by clearing bit VREN (VRCON<7>). This Reset also
disconnects the reference from the RA2 pin by clearing
bit VROE (VRCON<6>) and selects the high voltage
range by clearing bit VRR (VRCON<5>). The V
value select bits, VRCON<3:0>, are also cleared.
DS40044G-page 70
MOVLW
MOVWF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
BCF
CALL
DD
. The tested absolute accuracy of the Voltage Ref-
VREN
Note:
Voltage Reference Accuracy/Error
Operation During Sleep
Effects of a Reset
0x02
CMCON
STATUS,RP0 ;go to Bank 1
0x07
TRISA
0xA6
VRCON
STATUS,RP0 ;go to Bank 0
DELAY10
REF
R is defined in Table 17-3.
SS
V
output changes with fluctuations in
REF
REF
to V
VOLTAGE REFERENCE BLOCK DIAGRAM
VOLTAGE REFERENCE
CONFIGURATION
;4 Inputs Muxed
;to 2 comps.
;RA3-RA0 are
;outputs
;enable V
;low range set V
;10μs delay
from approaching V
V
DD
DD
cannot be realized due to
8R
REF
DD
R
derived and
R
<3:0>=6
SS
or V
R
REF
DD
.
16 Stages
16-1 Analog Mux
11.5
The Voltage Reference module operates independently
of the Comparator module. The output of the reference
generator may be connected to the RA2 pin if the
TRISA<2> bit is set and the VROE bit, VRCON<6>, is
set. Enabling the Voltage Reference module output onto
the RA2 pin with an input signal present will increase
current consumption. Connecting RA2 as a digital output
with V
tion.
The RA2 pin can be used as a simple D/A output with
limited drive capability. Due to the limited drive
capability, a buffer must be used in conjunction with the
Voltage Reference module output for external connec-
tions to V
technique.
R
REF
Connection Considerations
REF
enabled will also increase current consump-
R
. Figure 11-2 shows an example buffering
V
SS
© 2009 Microchip Technology Inc.
8R
V
V
R
R
3
0
(From VRCON<3:0>)
V
SS
VRR