PIC16F716 Microchip Technology, PIC16F716 Datasheet - Page 63

• Manufacturer Part Number: PIC16F716
• Description: 8-bit Flash-based Microcontroller with A/D Converter and Enhanced Capture/Compare/PWM
• Manufacturer: Microchip Technology

FIGURE 9-7:
FIGURE 9-8:
 2003 Microchip Technology Inc.
Note 1: This brown-out circuit is less expensive, albeit
Note 1: This circuit will activate Reset when V
V
V
DD
2: Internal Brown-out Reset should be disabled
3: Resistors should be adjusted for the
DD
2: Internal Brown-out Reset circuitry should be
R1
R2
33k
less accurate. Transistor Q1 turns off when V
is below a certain level such that:
when using this circuit.
characteristics of the transistor.
below (Vz + 0.7V) where Vz = Zener voltage.
disabled when using this circuit.
V
DD
x
10k
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
R1 + R2
R1
Q1
40k
40k
Q1
= 0.7 V
PIC16F716
PIC16F716
V
MCLR
MCLR
V
DD
DD
DD
goes
DD
Preliminary
FIGURE 9-9:
Note 1:
Vss
MCP809
RST
This brown-out protection circuit employs
Microchip Technology’s MCP809
microcontroller supervisor. The MCP8XX and
MCP1XX families of supervisors provide
push-pull and open collector outputs with
both high and low active Reset pins. There
are 7 different trip point selections to
accommodate 5V and 3V systems.
V
V
DD
DD
capacitor
bypass
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 3
PIC16F716
V
MCLR
PIC16F716
DD
DS41206A-page 61