LP3913 datasheet(27/70 Pages) TI1

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LP3913

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SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

Throughout this product specification, the register address is noted in hexadecimal notation immediately following

the register name as illustrated below:

PON Register (00)h Power On Event Register

D7–4

Battery Monitor

The battery voltage is monitored and will invoke the Power Off mode when the battery low threshold is breached

for more than 5 ms (Typ.). The battery low threshold DEFAULT is factory programmed. The battery low threshold

range is 2.5V–3.5V with steps of 50 mV. The Battery low threshold in the table below refers to a decreasing

battery voltage. The threshold when the battery voltage is transitioning out of the VBATTLOW is 50 mV (Typ.) higher

than the values listed in the table below due to a built-in hysteresis of 50 mV (Typ.).

The battery low IRQ is triggered 200 mV above the battery low alarm threshold that powers down the IC. This

gives the user time for a controlled shutdown.

BATTLOW Register (04)h Battery Low Alarm Register

D7–5

D4–0

Access

Read Only 0

Data

reserved

Battery Low Threshold Voltage (V)

Battery Low IRQ Threshold Voltage (V)

5’h14–1F

2.50

2.70

5’h13

2.55

2.75

5’h12

2.60

2.80

5’h11

2.65

2.85

5’h10

2.70

2.90

5’h0F

2.75

2.95

5’h0E

2.80

3.00

5’h0D

2.85

3.05

5’h0C

2.90

3.10

5’h0B

2.95

3.15

5’h0A

3.00

3.20

5’h09

3.05

3.25

5’h08

3.10

3.30

5’h07

3.15

3.35

5’h06

3.20

3.40

5’h05

3.25

3.45

5’h04

3.30

3.50

5’h03

3.35

3.55

5’h02

3.40

3.60

5’h01

3.45

3.65

5’h00

3.50

3.70

Reset

n/a

5’h0C

2.90

3.10

Power Off Mode

In Power Off mode the main battery, the battery charger supply, and the USB supply are below their minimum on

levels. All internal circuits are disabled as the supply voltage is below the level to activate them. The LP3913 is in

Power Off mode when the battery voltage is below the battery VUVLO (2.4V typ) except when a valid external

supply is detected.

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