DA9072 datasheet(30/113 Pages) DIALOG

30 / 113 page

DA9072

Ultra-Low Quiescent Current PMIC

Datasheet

Revision 3.0

14-Jun-2021

CFR0011-120-00

30 of 113

Table 21: MODE Functionality

VDD_PWR

MODE = 0

MODE = 1

Disconnected

Hi-Z mode (edge triggered)

Active Battery mode

Connected

Charge enabled if CE_N = 0

Charge disabled if CE_N = 1

Charge disabled

4.2.2

Battery Protection

DA9072 includes several types of battery protection. The battery is protected during discharge from

over-current conditions by the IBAT_DCHG function and from over-discharge conditions by the

VBAT_UVLO (under-voltage lockout) functions.

During charging, the temperature sense (TEMP_SNS) function protects against over-temperature,

and highly accurate voltage regulation and charging current prevent over-voltage and over-current

conditions.

4.2.2.1

VBAT Over-Current Protection

The battery discharge over-current protection threshold, IBAT_DCHG_RNG, is programmable from 0.55 A

to 1.75 A by IDISCHG_OCP (register 0x0029 [4:2]). Over-current protection clamps the maximum

battery current at the set threshold and is available in all modes of operation. Battery current starts to

be limited approximately 150 mA below the protection clamp. When an over-current condition occurs

during charging, safety timers and charge termination are suspended.

In an over-current fault, a VBAT_OCP interrupt is generated at SYS_FLT pin and indicated by the

event bit ISR_VBAT_OCP (register 0x0004 [2]).

All battery current flows from VBAT to VDD_SYS. Therefore, set the IBAT_DCHG threshold higher

than the maximum expected system current from VDD_SYS. However, if the threshold is set higher

than the battery can support, battery voltage may drop below VBAT_UVLO before the current is

limited. When the IBAT_DCHG function clamps the battery current, VDD_SYS droops. This may

cause secondary fault conditions such as VDD_SYS UVLO.

4.2.2.2

VBAT Under-Voltage and Short Protection

The battery under-voltage protection threshold (VBAT_UVLO_THR) can be set from 2.5 V to 3.0 V by bits

BUVLO (register 0x000E [2:0])

. This should be set at or above the battery’s minimum discharge

voltage specification. VBAT_UVLO protects the battery from over-discharge by disconnecting the

discharge path when the battery voltage falls below the UVLO threshold.

When a VBAT_UVLO occurs in battery powered modes (VDD_PWR not connected), the DA9072

outputs, including VDD_SYS, shut down and all registers are reset to their default PoR values.

VBAT_UVLO generates an interrupt at SYS_FLT and is indicated by the ISR_VBAT_UVLO event bit

(register 0x0004 [0]).

With VDD_PWR connected, VBAT_UVLO is ignored, making pre-charge level charging available

down to 0 V at VBAT. In this case, a separate fault condition applies: VBAT_SHORT. The

VBAT_SHORT threshold is typically 2.0 V and is indicated by event bit ISR_VBAT_SHORT (register

0x0004[3]).

4.2.2.3

Battery Temperature Sensing

The TEMP_SNS

function uses the battery’s NTC thermistor to monitor battery temperature. If the

battery is too cold or hot, either the fast charge current (or target voltage) is reduced or charging is

terminated. Table 22 summarizes what protective measures are taken in each temperature range.

DA9072 Datasheet(PDF) 30 Page - Dialog Semiconductor

DA9072 Datasheet(HTML) 30 Page - Dialog Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL