PIC16C621A Datasheet

IC型号：
PIC16C621A
PDF描述：
EPROM-Based 8-Bit CMOS Microcontrollers
文件大小：
2148.18KB
PDF页数：
128页
芯片厂家：
Microchip

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PIC16C62X

8.0

VOLTAGE REFERENCE

MODULE

8.1

Con铿乬uring 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:

if V

= 1: V

REF

= (V

<3:0>/24) x V

if V

= 0: V

REF

= (V

x 1/4) + (V

<3:0>/32) x V

The setting time of the Voltage Reference must be

considered when changing the V

REF

output

(Table 12-2). Example 8-1 shows an example of how to

con铿乬ure the Voltage Reference for an output voltage

of 1.25V with V

= 5.0V.

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

REF

values and has a power-down function to

conserve power when the reference is not being used.

The VRCON register controls the operation of the

reference as shown in Figure 8-1. The block diagram is

given in Figure 8-2.

FIGURE 8-1:

R/W-0

REN

bit7

VRCON REGISTER(ADDRESS 9Fh)

R/W-0

U-0

鈥?/div>

R/W-0

bit0

R/W-0

ROE

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n =Value at POR reset

bit 7:

REN

REF

Enable

1 = V

REF

circuit powered on

0 = V

REF

circuit powered down, no I

drain

ROE

REF

Output Enable

1 = V

REF

is output on RA2 pin

0 = V

REF

is disconnected from RA2 pin

REF

Range selection

1 = Low Range

0 = High Range

Unimplemented:

Read as '0'

bit 6:

bit 5:

bit 4:

bit 3-0:

<3:0>:

REF

value selection 0

鈮?/div>

[3:0]

鈮?/div>

when V

= 1: V

REF

= (V

<3:0>/ 24) * V

when V

= 0: V

REF

= 1/4 * V

+ (V

<3:0>/ 32) * V

FIGURE 8-2:

VOLTAGE REFERENCE BLOCK DIAGRAM

16 Stages

REN

REF

16-1 Analog Mux

(From VRCON<3:0>)

Note:

R is de铿乶ed in Table 12-3.

漏

1998 Microchip Technology Inc.

Preliminary

DS30235G-page 43

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