BQ25708 datasheet(32/77 Pages) TI1

32 / 77 page

bq25708

SLUSCU2 – NOVEMBER 2017

www.ti.com

Product Folder Links: bq25708

Submit Documentation Feedback

Table 7. ChargeOption0 Register (SMBus address = 12h) Field Descriptions (continued)

SMBus

BIT

FIELD

TYPE

RESET

DESCRIPTION

PWM_FREQ

R/W

Switching Frequency

Two converter switching frequencies. One for small inductor and the other for

big inductor.

Currently, customer uses 800 kHz with 2.2 µH or 3.3 µH, and 1.2 MHz with 1

µH or 1.5 µH.

0b: 1.2 MHz

1b: 800 kHz <default at POR>

Reserved

R/W

Reserved

Table 8. ChargeOption0 Register (SMBus address = 12h) Field Descriptions

SMBus

BIT

FIELD

TYPE

RESET

DESCRIPTION

7-6

Reserved

R/W

00b

Reserved

EN_LEARN

R/W

LEARN function allows the battery to discharge while the adapter is present. It

calibrates the battery gas gauge over a complete discharge/charge cycle.

When the battery voltage is below battery depletion threshold, the system

switches back to adapter input by the host. When CELL_BATPRESZ pin is

LOW, the device exits LEARN mode and this bit is set back to 0.

0b: Disable LEARN Mode <default at POR>

1b: Enable LEARN Mode

IADPT_GAIN

R/W

IADPT Amplifier Ratio

The ratio of voltage on IADPT and voltage across ACP and ACN.

0b: 20× <default at POR>

1b: 40×

IBAT_GAIN

R/W

IBAT Amplifier Ratio

The ratio of voltage on IBAT and voltage across SRP and SRN

0b: 8×

1b: 16× <default at POR>

EN_LDO

R/W

LDO Mode Enable

When battery voltage is below minimum system voltage (REG0x3E()), the

charger is in pre-charge with LDO mode enabled.

0b: Disable LDO mode, BATFET fully ON. Precharge current is set by battery

pack internal resistor. The system is regulated by the MaxChargeVoltage

1b: Enable LDO mode, Precharge current is set by the ChargeCurrent register

and clamped below 384 mA (2 cell – 4 cell) or 2A (1 cell). The system is

regulated by the MinSystemVoltage register. <default at POR>

EN_IDPM

R/W

IDPM Enable

Host writes this bit to enable IDPM regulation loop. When the IDPM is disabled

by the charger (refer to IDPM_AUTO_DISABLE), this bit goes LOW.

0b: IDPM disabled

1b: IDPM enabled <default at POR>

CHRG_INHIBIT

R/W

Charge Inhibit

When this bit is 0, battery charging will start with valid values in the

MaxChargeVoltage register and the ChargeCurrent register.

0b: Enable Charge <default at POR>

1b: Inhibit Charge

BQ25708 Folha de dados(PDF) 32 Page - Texas Instruments

BQ25708 Folha de dados(HTML) 32 Page - Texas Instruments

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

Folha de dados Download

Ligação URL