PIC16LC621A-04E/SO Microchip Technology, PIC16LC621A-04E/SO Datasheet - Page 45

• Manufacturer Part Number: PIC16LC621A-04E/SO
• Description: IC MCU OTP 1KX14 COMP 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16LC621A-04E/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 13
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: OTP
• Ram Size: 96 x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 18-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Other names: PIC16LC621A-04ESO

8.0
The Voltage Reference is a 16-tap resistor ladder
network that provides a selectable voltage reference.
The resistor ladder is segmented to provide two ranges
of V
conserve power when the reference is not being used.
The VRCON register controls the operation of the
reference as shown in Register 8-1. The block diagram
is given in Figure 8-1.
REGISTER 8-1:
FIGURE 8-1:
 2003 Microchip Technology Inc.
V
REN
REF
Note:
VOLTAGE REFERENCE
MODULE
values and has a power-down function to
bit 7
bit 6
bit 5
bit 4
bit 3-0
R is defined in Table 12-2.
V
REF
VOLTAGE REFERENCE BLOCK DIAGRAM
VRCON REGISTER(ADDRESS 9Fh)
bit 7
V
1 = V
0 = V
V
1 = V
0 = V
V
1 = Low Range
0 = High Range
Unimplemented: Read as '0'
V
when V
when V
Legend:
R = Readable bit
- n = Value at POR
R
REN
ROE
RR
R/W-0
V
<3:0>: V
REN
: V
: V
: V
REF
REF
REF
REF
REF
RR
RR
8R
REF
REF
circuit powered on
circuit powered down, no I
is output on RA2 pin
is disconnected from RA2 pin
= 1: V
= 0: V
Range selection
REF
Enable
Output Enable
R/W-0
V
value selection 0 ≤ V
ROE
REF
REF
R
= (V
= 1/4 * V
R
R/W-0
R
<3:0>/ 24) * V
V
W = Writable bit
’1’ = Bit is set
RR
DD
16 Stages
+ (V
16-1 Analog Mux
DD
R
R
[3:0] ≤ 15
<3:0>/ 32) * V
U-0
drain
—
8.1
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 setting time of the Voltage Reference must be
considered when changing the V
Example 8-1 shows an example of how to configure the
Voltage Reference for an output voltage of 1.25V with V
= 5.0V.
DD
if V
if V
R
RR
RR
Configuring the Voltage Reference
R/W-0
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
= 0: V
= 1: V
V
R
DD
3
R
REF
REF
= (V
= (V
R/W-0
V
DD
R
R
PIC16C62X
8R
2
<3:0>/24) x V
x 1/4) + (V
V
V
R
R
3
0
REF
x = Bit is unknown
(From VRCON<3:0>)
R/W-0
V
output (Table 12-1).
R
DS30235J-page 43
R
1
<3:0>/32) x V
DD
V
RR
R/W-0
V
R
0
bit 0
DD
DD