LP3944 datasheet(9/17 Pages) TI1

9 / 17 page

LP3944

www.ti.com

SNVS264 – MAY 2004

Figure 9. Register Address Byte

In the READ mode, when auto increment is enabled, I2C master could receive any number of bytes from LP3944

without selecting chip address and register address again. Every time the I2C master reads a register, the

LP3944 will increment the register address and the next data register will be read. When I2C master reaches the

last register (09H register), the register address will roll over to 00H.

In the WRITE mode, when auto increment is enabled, the LP3944 will increment the register address every time

I2C master writes to register. When the last register (09H register) is reached, the register address will roll over to

02H, because the first two registers in LP3944 are read-only registers. It is possible to write to these two

registers, and the LP3944 will acknowledge, but the data will be ignored.

In the LP3944, registers 0x01, 0x08 and 0x09 are not functional. However, it is still necessary to read from 0x01

and to write to 0x08 and 0x09 in Auto Increment mode. They cannot be skipped.

If auto increment is disabled, and the I2C master does not change register address, it will continue to write data

into the same register.

Figure 10. Programming with Auto Increment Disabled (in WRITE Mode)

Figure 11. Programming with Auto Increment Enabled (in WRITE Mode)

Table 1. LP3944 Register Table

Address (Hex)

Read/Write

0x00

Input 1

Read Only

LED0–7 Input Register

0x01

Read Only

None

0x02

PSC0

R/W

Frequency Prescaler 0

0x03

PWM0

R/W

PWM Register 0

0x04

PSC1

R/W

Frequency Prescaler 1

0x05

PWM1

R/W

PWM Register 1

0x06

LS0

R/W

LED0–3 Selector

0x07

LS1

R/W

LED4–7 Selector

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