LP8720

SNVS575B – JULY 2008 – REVISED MAY 2013

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Table 6. Register 0x08

LDO1_EN LDO2_EN LDO3_EN

In STANDBY mode

In IDLE mode the bit has immediate

LDO4_EN LDO5_EN BUCK_EN

1 – During next startup sequence will be enabled.

effect.

0 – During next startup sequence will be NOT enabled.

1 – Enable

For proper operation output having “111 NO startup” should

0 – Disable

have corresponding enable bit 0 (disable).

SLEEP_MODE

1 – SLEEP

0 – normal

This bit has effect only if EXT_SLEEP_CONTROL=0 (register 0x00)

DVS_V2/V1

1 – buck voltage is BUCK_V1[4:0]

0 – buck voltage is BUCK_V2[4:0]

This bit has effect only if EXT_DVS_CONTROL=0 (register 0x00)

Table 7. Register 0x09

LDO1_PULLDOWN

1 – pull-down enabled

LDO2_PULLDOWN

0 – pull-down disabled

LDO3_PULLDOWN

LDO4_PULLDOWN

LDO5_PULLDOWN

BUCK_PULLDOWN

APU_TSD

This bit defines either to reset registers or not before LP8720 automatically starts startup sequence from

Thermal Shutdown after cooling down if EN-pin is High.

1 – No change to registers – registers content stays the same as before Thermal Shutdown.

0 – Reset registers to default values before startup from Thermal Shutdown.

Table 8. Register 0x0A (Read Only)

TSD

1 – device is in Thermal Shutdown.

0 – device is NOT in Thermal Shutdown .

TSD_EW

1 – device temperature is higher than Thermal Shutdown Early Warning threshold.

0 – device temperature is lower than Thermal Shutdown Early Warning threshold.

Table 9. Register 0x0B (Read Only)

TSD_INT

1 – Interrupt that was caused by Thermal Shutdown

0 – No Interrupt that was caused by Thermal Shutdown

TSD_EW

1 – Interrupt that was caused by Thermal Shutdown Early Warning

0 – No Interrupt that was caused by Thermal Shutdown Early Warning

Table 10. Register 0x0C

TSD_MASK

1 – TSD interrupt is masked

0 – TSD interrupt is NOT masked

TSD_EW_MASK

1 – TSD_EW interrupt is masked

0 – TSD_EW interrupt is NOT masked

Support Functions

Reference

The LP8720 has an internal reference block creating all necessary references and biasing for all blocks.

Oscillator

There is an internal oscillator giving clock to the bucks and to logic control.

Parameter

Typ

Min

Max

Unit

Oscillator frequency

2.0

1.9

2.1

MHz

8

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