TPS65921 datasheet(49/58 Pages) TI1

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SWCS048-027

USB_DET_ON

USP_P=1

and

(USB_HW_CHRG_DET_EN=1 or

USB_SW_CHRG_DET_EN=1)

Dcounter<DCD_TIMEOUT

CHGDCTRL=000_0000

USB_DET_OFF

(USB_HW_CHRG_DET_EN=0 and

USB_SW_CHRG_DET_EN=0)

CHGDCTRL=”000_0000"

INIT

CHGDCTRL=”011_1010"

DCD_INIT

DATA_CONTACT_DET_EN=1

Dcounter=0

Wait TIDP_SRC_ON

DCD_SETUP

Dcounter=Dcounter+1

DCD_CHECK

End wait

Dcounter=DCD_TIMEOUT

CHGD_SERX_DP_DEB=0

CHGDCTRL=”011_0110"

CHGD_INIT

DATA_CONTACT_DET_EN=0

Wait TVDP_SCR_ON

CHGD_SETUP

CHGD_SERX_DM_DEB=0

and

CHGD_VDM_DEB=1

End wait

Always ON

CHGD

CHECK

CHGDCTRL=010_0000

Wait TVDP_SRC_HICRNT

USB500_WAIT

CHGDCTRL=100_0000

USB500_DETECTED

End wait

CHGDCTRL=xxx_0000

USB charger status is memorized

USB_DET_STS

USP_P=0

USB_P=0

(USB_HW_CHRG_DET_EN=0 and

USB_SW_CHRG_DET_EN=0)

TPS65921

www.ti.com

SWCS048F – MARCH 2010 – REVISED MARCH 2012

Figure 25. USB Battery Charger Detection FSM

USB charger detection status bit definition:

•

USBVBUS_PRES: Detect presence of valid VBUS. Comparator output is debounced for DEBVBUS_TIME

(minimum 10 ms) on CKCHG and generates a USB_P signal. USB_P is computed only if a battery presence

is detected.

•

USBCHRG_PRES: Detect presence of USB charger on DP/DM. The feature is enabled through the

USB_DET_EN signal, then USBPHY performs checks on DP/DM and return status USB_DET_RESULT:

–

1 : USB 500-mA charger is detected.

–

0 : USB 100-mA charger is detected.

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