PIC16F785 datasheet(77/178 Pages) MICROCHIP

Il numero della parte	PIC16F785

Spiegazioni elettronici	20-Pin Flash-Based 8-Bit CMOS Microcontroller with Two-Phase Asychronous Feedback PWM, Dual High-Speed Comparators and Dual Operational Amplifiers

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77 / 178 page

 2004 Microchip Technology Inc.

Preliminary

DS41249A-page 75

PIC16F785

11.3

Effects of RESET

A device RESET forces all registers to their RESET

state. This disables both op amps.

11.4

OPA Module Performance

Common AC and DC performance specifications for

the OPA module:

• Common Mode Voltage Range

• Leakage Current

• Input Offset Voltage

• Open Loop Gain

• Gain Bandwidth Product (GBWP)

Common mode voltage range is the specified voltage

range for the OPA+ and OPA- inputs, for which the OPA

module will perform to within its specifications. The

OPA module is designed to operate with input voltages

between 0 and VDD-1.4V. Behavior for common mode

voltages greater than VDD-1.4V, or below 0V, are

beyond the normal operating range.

Leakage current is a measure of the small source or

sink currents on the OPA+ and OPA- inputs. To mini-

mize the effect of leakage currents, the effective imped-

ances connected to the OPA+ and OPA- inputs should

be kept as small as possible and equal.

Input offset voltage is a measure of the voltage differ-

ence between the OPA+ and OPA- inputs in a closed

loop circuit with the OPA in its linear region. The offset

voltage will appear as a DC offset in the output equal to

the input offset voltage, multiplied by the gain of the

circuit. The input offset voltage is also affected by the

common mode voltage.

Open loop gain is the ratio of the output voltage to the

differential input voltage, (OPA+) - (OPA-). The gain is

greatest at DC and falls off with frequency.

Gain Bandwidth Product or GBWP is the frequency

at which the open loop gain falls off to 0 dB.

TABLE 11-1:

REGISTERS ASSOCIATED WITH THE OPA MODULE

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR, BOR

Value on

all other

RESETS

11Ch

OPA1CON

OPAON

—

0--- ---- 0--- ----

11Dh

OPA2CON

OPAON

—

0--- ---- 0--- ----

91h

ANSEL0

ANS7

ANS6

ANS5

ANS4

ANS3

ANS2

ANS1

ANS0 1111 1111 1111 1111

93h

ANSEL1

—

ANS11 ANS10 ANS9

ANS8 ---- 1111 ---- 1111

86h,

186h

TRISB

TRISB7

TRISB6 TRISB5 TRISB4

—

1111 ----

87h,

187h

TRISC

TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 1111 1111

1111 1111

Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used for the OPA

module.

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