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7.3.5.2 UVLO

The LP50xx device has an internal comparator that monitors the voltage at VCC. When VCC is below VUVF, reset

is active and the LP50xx device is in the INITIALIZATION state.

7.4 Device Functional Modes

INITIALIZATION

STANDBY

EN = H

From all states

RESET = FF or UVLO = H

SHUTDOWN

EN = L

From all states

VCC Power Up

Chip_EN = 1

Chip_EN = 0

NORMAL

POWER SAVE

I2C Command

Power_Save_EN =1 and

All LEDs off > 30ms

THERMAL

SHUTDOWN

TSD=H

TSD=L

Figure 7-7. Functional Modes

• INITIALIZATION: The device enters into INITIALIZATION mode when EN = H. In this mode, all the registers

are reset. Entry can also be from any state, if the RESET (register) = FFh or UVLO is active.

• NORMAL: The device enters the NORMAL mode when Chip_EN (register) = 1. ICC is 10mA (typical).

• POWER SAVE: The device automatically enters the POWER SAVE mode when Power_Save_EN (register)

= 1 and all the LEDs are off for a duration of > 30ms. In POWER SAVE mode, analog blocks are disabled

to minimize power consumption, but the registers retain the data and keep it available via I2C. ICC is 10µA

(typical). In case of any I2C command to this device, it returns to the NORMAL mode.

• SHUTDOWN: The device enters into SHUTDOWN mode from all states on VCC power up or when EN = L.

ICC is < 1µA (maximum).

• STANDBY: The device enters the STANDBY mode when Chip_EN (register) = 0. In this mode, all the

OUTx pins are shut down, but the registers retain the data and keep it available via I2C. STANDBY is the

low-power-consumption mode, when all circuit functions are disabled. ICC is 10µA (typical).

• THERMAL SHUTDOWN: The device automatically enters the THERMAL SHUTDOWN mode when the

junction temperature exceeds 160°C (typical). In this mode, all the OUTx outputs are shut down. If the

junction temperature decreases below 145°C (typical), the device returns to the NORMAL mode.

7.5 Programming

7.5.1 I2C Interface

The I2C-compatible two-wire serial interface provides access to the programmable functions and registers on the

device. This protocol uses a two-wire interface for bidirectional communications between the devices connected

LP5018, LP5024

SLVSEB8C – OCTOBER 2018 – REVISED JULY 2024

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