MAX7314 Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX7314

18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection

Maxim Integrated 

18-Port GPIO with LED Intensity Control,

Interrupt, and Hot-Insertion Protection

Table 2. Register Address Map

REGISTER

Read input ports P7–P0

Read input ports P15–P8

Blink phase 0 outputs P7–P0

Blink phase 0 outputs P15–P8

Ports configuration P7–P0

Ports configuration P15–P8

Blink phase 1 outputs P7–P0

Blink phase 1 outputs P15–P8

Master, O16 intensity

Configuration

Outputs intensity P1, P0

Outputs intensity P3, P2

Outputs intensity P5, P4

Outputs intensity P7, P6

Outputs intensity P9, P8

Outputs intensity P11, P10

Outputs intensity P13, P12

Outputs intensity P15, P14

ADDRESS CODE

(hex)

0x00

0x01

0x02

0x03

0x06

0x07

0x0A

0x0B

0x0E

0x0F

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

AUTOINCREMENT

ADDRESS

0x01

0x00

0x03

0x02

0x07

0x06

0x0B

0x0A

0x0E (no change)

0x0F (no change)

0x11

0x12

0x13

0x14

0x15

0x16

0x17

0x10

Device Reset

The reset input RST is an active-low input. When taken

low, RST clears any transaction to or from the MAX7314

on the serial interface and configures the internal regis-

ters to the same state as a power-up reset (Table 3),

which resets all ports as inputs. The MAX7314 then

waits for a START condition on the serial interface.

Detailed Description

Initial Power-Up

On power-up, and whenever the RST input is pulled

low, all control registers are reset and the MAX7314

enters standby mode (Table 3). Power-up status makes

all ports into inputs and disables both the PWM oscilla-

tor and blink functionality. RST can be used as a hard-

ware shutdown input, which effectively turns off any

LED (or other) loads and puts the device into its lowest

power condition.

Configuration Register

The configuration register is used to configure the PWM

intensity mode, interrupt, and blink behavior, operate

the INT/O16 output, and read back the interrupt status

(Table 4).

Ports Configuration

The 16 I/O ports P0 through P15 can be configured to

any combination of inputs and outputs using the ports

configuration registers (Table 5). The INT/O16 output

can also be configured as an extra general-purpose

output, and the BLINK input can be configured as an

extra general-purpose input using the configuration

register (Table 4).

Input Ports

The input ports registers are read only (Table 6). They

reflect the incoming logic levels of the ports, regardless of

whether the port is defined as an input or an output by the

ports configuration registers. Reading an input ports reg-

ister latches the current-input logic level of the affected

eight ports. A write to an input ports register is ignored.

______________________________________________________________________________________ 11

Share Link: