LP55231 datasheet(17/59 Pages) TI2

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STANDBY

RESET

INTERNAL

STARTUP

SEQUENCE

Reset Register = FF

POR=H

TSD = H

NORMAL MODE

EN=H (pin) and

CHIP_EN=H (bit)

EN=L (pin) or

CHIP_EN=L (bit)

POR

TSD = L

POWER SAVE

Enter power save

Exit power save

LP55231

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SNOSCR5D – MARCH 2013 – REVISED DECEMBER 2016

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7.4 Device Functional Modes

7.4.1 Modes Of Operation

RESET:

In the RESET mode all the internal registers are reset to the default values. Reset is always

entered if Reset Register (3DH) is written FFH or internal Power-On Reset is active. Power-On

Reset (POR) activate during the chip start-up or when the supply voltage VDD fall below 1.5 V

(typical). Once VDD rises above 1.5 V (typical), POR deactivate, and the chip continues to the

STANDBY mode. CHIP_EN control bit is low after POR by default.

STANDBY: The STANDBY mode is entered if the register bit CHIP_EN or EN pin is LOW and Reset is not

active. This is the low-power consumption mode, when all circuit functions are disabled. Most

registers can be written in this mode if EN pin is risen to high so that control bits are effective right

after the start-up (see Control Register Details).

START-UP: When CHIP_EN bit is written high, and EN pin is high, the INTERNAL START-UP SEQUENCE

powers up all the needed internal blocks (VREF, Bias, Oscillator etc.). Start-up delay is 500 μs. If

the chip temperature rises too high, the Thermal Shutdown (TSD) disables the chip operation, and

the chip waits in START-UP mode until no thermal shutdown event is present.

NORMAL:

During NORMAL mode the user controls the chip using the Control Registers.

POWER SAVE: In POWER-SAVE mode analog blocks are disabled to minimize power consumption. See

Automatic Power-Save Mode section for further information.

Figure 19. Modes of Operation

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