MSP430F435IPZ datasheet(38/85 Pages) TI

38 / 85 page

MSP430x43x, MSP430x44x

MIXED SIGNAL MICROCONTROLLER

SLAS344A – JANUARY 2002 – REVISED FEBRUARY 2002

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

comparator_A

The primary functions of the comparator module are: support of precision slope conversion in A/D applications,

battery voltage supervision, and external analog signal monitoring. The comparator is connected to port pins

P1.6/CA0 (+ terminal) and P1.7/CA1 (– terminal). It is controlled by eight control bits in the CACTL register. A

block diagram of comparator_A is shown in Figure 7.

P2CA0

P2CA1

CAON

CAEX

CAF

Low Pass Filter

τ ≈ 2 µs

CCI1B

Set CAIFG

Flag

CAOUT

CARSEL

VCAREF

CAREF

0.5 x VCC

0.25 x VCC

CA1

CA0

0 V

VCC

0 V

CAON

VCC

0 V

P2.6/CAOUT/S19

P1.6/

CA0

P1.7/

CA1

Figure 7. Block Diagram of Comparator_A

The eight control bits are used to connect the comparator to the supply voltage, apply external or internal signals

to the + terminal and – terminal, and select the comparator output, including a small filter.

Eight additional bits in register CAPD are implemented into the Comparator_A module and enable the SW to

switch off the input buffer of Port P1. A CMOS input buffer dissipates supply current when the input is not near

VSS or VCC. Control bits CAPI0 to CAPI7 are initially reset and the port input buffer is active. The port input buffer

is inactive if the corresponding control bit is set.

MSP430F435IPZ Datasheet(PDF) 38 Page - Texas Instruments

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