MAX6946CAWE 查看數據表（PDF） - Maxim Integrated

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MAX6946CAWE

10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control

Maxim Integrated 

10-Port, Constant-Current LED Driver and

I/O Expander with PWM Intensity Control

Configuration Register (0x10)

Use the configuration register to select PWM phasing

between outputs, test fade status, enable hardware

startup from shutdown, and select shutdown or run

mode (Table 2).

Initial Power-Up

All control registers reset upon power-up (Table 3).

Power-up status sets I/O ports P0 to P9 to high imped-

ance, and puts the device into shutdown. The

MAX6946/MAX6947 powers up in shutdown.

Table 2. Configuration Register (0x10)

REGISTER BIT

DESCRIPTION VALUE

FUNCTION

D7

OSC enable*

0

Internal oscillator enabled as PWM clock source

1

External oscillator input enabled as PWM clock source

0

RST does not change register data

D6

RSTPOR options

1

RST resets registers to POR (power-on reset) state

D5

PWM stagger

0

PWM outputs are in phase

1

PWM outputs stagger phase

0

Device not in hold-off

D4

Hold-off status**

1

Device in hold-off

0

Device not in fade-off

D3

Fade-off status**

1

Device in fade-off

0

Device not in ramp-up

D2

Ramp-up status**

1

Device in ramp-up

D1

RST RUN enable

0

Reset Run disabled

1

Reset Run enabled

D0

RUN enable

0

Shutdown mode

1

Run mode

*The OSCEN bit applies only to the MAX6946. OSCEN is always 0 for the MAX6947, and the MAX6947 ignores writes to the OSCEN bit.

**Read-only bits.

Table 3. Initial Power-Up Register Status

DESCRIPTION

POWER-UP CONDITION

ADDRESS

REGISTER BIT

CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0

Port P0–P9 output level

or PWM

Port 0–9 high impedance

0x00–0x09 1 1 1 1 1 1 1 1

Configuration

Ramp-down/hold-off

Ramp-up

Shutdown mode, Reset Run disabled

Fade/hold-off disabled

Disabled

0x10

0x11

0x12

0/1* 0 0 0 0 0 0 0

00000000

00000000

Output current ISET70

Output current ISET98

Global current

IPEAK = 10mA for ports P7–P0

IPEAK = 10mA for ports P9, P8

Full current

0x13

0x14

0x15

00000000

00000000

00000111

*Value is 0 for MAX6947 and 1 for MAX6946 bit.

8 _______________________________________________________________________________________

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