DSPIC33EP128GS708 datasheet(349/484 Pages) MICROCHIP

349 / 484 page

 2016-2018 Microchip Technology Inc.

DS70005258C-page 349

dsPIC33EPXXXGS70X/80X FAMILY

26.0 CONSTANT-CURRENT

SOURCE

The constant-current source module is a precision

current generator and is used in conjunction with the

ADC module to measure the resistance of external

resistors connected to device pins.

26.1

Features Overview

The constant-current source module offers the following

major features:

• Constant-Current Generator (10 µA nominal)

• Internal Selectable Connection to One of Four Pins

• Enable/Disable bit

26.2

Module Description

Figure 26-1 shows a functional block diagram of the

constant-current source module. It consists of a

precision current generator with a nominal value of

10 µA. The module can be enabled and disabled using

the ISRCEN bit in the ISRCCON register. The output

of the current generator is internally connected to a

device pin. The dsPIC33EPXXXGS70X/80X family

can have up to four selectable current source pins.

The OUTSEL<2:0> bits in the ISRCCON register allow

selection of the target pin.

The current source is calibrated during testing.

FIGURE 26-1:

CONSTANT-CURRENT SOURCE MODULE BLOCK DIAGRAM

Note 1: This

data

sheet

summarizes

the

features of the dsPIC33EPXXXGS70X/

80X family of devices. It is not intended

to be a comprehensive reference source.

To complement the information in this data

sheet, refer to the related section of the

“dsPIC33/PIC24 Family Reference Man-

ual”, which is available from the Microchip

website (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

ISRC1

ISRC3

OUTSEL<2:0>

ISRC2

ISRC4

ISRCEN

Constant-Current Source

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