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Rainbow Electronics MAX5970 User Manual

Page 36

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0V to 16V, Dual Hot-Swap Controller with 10-Bit

Current and Voltage Monitor and 4 LED Drivers

MAX5970

36 _____________________________________________________________________________________

Table 53. LED State Register

Table 54. MAX5970 Slave Address Settings

Table 53 shows LED State register. The LED State regis-
ter is a read-only register. When the LEDs are disabled,
the pins are configured as GPIOs. Applying an external
voltage below 0.4V sets the GPIOs low and, applying an
external voltage above 1.4V, sets the GPIOs high.

I

2

C Serial Interface

The MAX5970 features an I

2

C serial interface consist-

ing of a serial-data line (SDA) and a serial-clock line

(SCL). SDA and SCL allow bidirectional communication
between the MAX5970 and the master device at clock
rates from up to 400kHz. The I

2

C bus can have several

devices (e.g., more than one MAX5970, or other I

2

C

devices in addition to the MAX5970) attached simultane-
ously. The A0 and A1 inputs set one of nine possible I

2

C

addresses (see Table 54).

Description:

LED State register

Register Title:

LED_State

Register Address:

0x45

R

R

R

R

R

R

R

R

RESET

VALUE

LED4

Voltage

LED3

Voltage

LED2

Voltage

LED1

Voltage

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

ADDRESS INPUT

STATE

I

2

C ADDRESS BITS

A1

A0

ADDR 7

ADDR 6

ADDR 5

ADDR 4

ADDR 3

ADDR 2

ADDR 1

ADDR 0

Low

Low

0

1

1

1

0

1

0

R/W

Low

High

0

1

1

1

0

0

1

R/W

Low

Open

0

1

1

1

0

0

0

R/W

High

Low

0

1

1

0

1

1

0

R/W

High

High

0

1

1

0

1

0

1

R/W

High

Open

0

1

1

0

1

0

0

R/W

Open

Low

0

1

1

0

0

1

0

R/W

Open

High

0

1

1

0

0

0

1

R/W

Open

Open

0

1

1

0

0

0

0

R/W