PS501 datasheet(16/42 Pages) MICROCHIP

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PS501

DS21818C-page 16

 2004 Microchip Technology Inc.

7.0

GPIO CONFIGURATION

GPIOs can be set up to act as inputs or outputs that are

based on conditions involving SBData parameters or

GPIO levels compared to constants. This powerful pro-

gramming model allows for customizing GPIO to set on

any possible fuel gauge conditions and reset on any

other possible fuel gauge conditions in any groupings.

TABLE 7-1:

GPIO CONFIGURATIONS

GPIOs configured above as standard logic output can

be programmed to activate or reset in response to any

group of fuel gauge conditions. Each “condition” is

defined by 4 bytes.

TABLE 7-2:

GPIO CONDITIONS

Name

Length

Definition

GPIOSTATE

Initialized default state (positive logic)

GPIODIRECTION

Initialized direction:

= input

= output

GPIOCONFIG

GPIO configuration

Bit 8:

= pull-ups/downs disabled

= pull-downs enabled

Bits 7:0:

if input:

= pulled down

= pulled up

if output:

= LED drive (GPIO0-7 only)

= standard logic

GPIOPOLARITY

“Polarity” mask applied to invert positive logic

Byte

Condition

Definition

Byte 1

Flags

bit 7:

1 signifies last condition in group

bit 4:

Combination function (1:AND, 0:OR)

bit 3:

Signed (1) or unsigned (0)

bits 2:0 Comparison function (0 : >, 1 : <, 2 : =, 3 : AND, 4 : NOR)

Byte 2

Condition selection

x00-x3F – SBData command code

x40 – State flags

x41 – GPIO flags

x42 – VCELL-min

x43 – VCELL-max

x44 – VCELL-diff

x45 – Misc. flags

Byte 3

Byte 4

Condition threshold

Constant

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