BQ24392-Q1_15 Datasheet, PDF (9/22 Pages) Texas Instruments – BQ24392-Q1 Dual SPST USB 2.0 High Speed Switch With USB Battery Charging Specification Revision 1.2 Detection

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BQ24392-Q1
SLIS160B – AUGUST 2014 – REVISED JANUARY 2015
Feature Description (continued)
When a micro or mini-USB accessory is inserted into the connector and once VVBUS is greater than V_{VBUS_VALID}
threshold, the BQ24392-Q1 will enter into the Data Contact Detection (DCD) state which includes a 600-ms
timeout feature that is prescribed in the USB Battery Charging Specification version 1.2 (BCv1.2). If the micro or
mini-USB accessory is determined to be USB BCv1.2 compliant, a 130-ms debounce period will initiate and the
BQ24392-Q1 will proceed to its primary detection and then secondary detection states to determine if a
Dedicated Charging Port (DCP), Standard Downstream Port (SDP), or Charging Downstream Port (CDP) is
attached to the USB-port. The minimum detection time for a DCP, SDP, and CDP is 130 ms, but can be as long
as 600 ms due to the slow plug in effect.
If the GOOD_BAT pin is high, the USB 2.0 switches are automatically closed to enable data transfer after the
device detects a Standard Downstream Port (SDP) or Charging Downstream Port (CDP) was connected.
If Data Contact Detection (DCD) fails, the BQ24392-Q1 proceeds to detect whether an Apple or TomTom
charger was inserted by checking the voltage level on DP_CON and DM_CON. Thus, for Apple and TomTom
chargers, detection time typically takes ~600 ms.
The 3 output pins CHG_AL_N, CHG_DET, and SW_OPEN change their status at the end of detection. Table 1 is
the detection table with the GPIO status for each type of supported charger. More information on how to use the
GPIOs is available in Using the BQ24932 GPIOs .
Device
Type
VBUS
DP_CON
(D+)
Table 1. Detection Table
DM_CON
(D–)
GOOD_BA
T
CHG_AL_N
(Input)
(Output)
CHG_DET
(Output)
Standard
Downstrea
m Port
> 3.5 V
Pull-down R to
GND
Pull-down R to
GND
Charging
Downstrea
m Port
> 3.5 V
Pull-down R to
GND
V_{DM_SRC}
Dedicated
Charging
Port
Apple
Charger
TomTom
Charger
PS/2
Charger
Non-
compliant
USB
Charger
Any Device
Any Device
DBP
Timer
Expired
> 3.5 V
> 3.5 V
> 3.5 V
> 3.5 V
> 3.5 V
< 3.5 V
> 3.5 V
Short to D–
Short to D+
2.0 V < V_{DP_CON} <
2.8 V
2.0 V < V_{DP_CON} <
3.1 V
Pull-up R to V_VBUS
2.0 V < V_{DM_CON}
< 2.8 V
2.0 V < V_{DM_CON}
< 3.1 V
Pull-up R to
V_VBUS
Open
Open
Open
Open
X
X
HIGH
LOW
HIGH
LOW
X
X
X
X
X
X
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
High-Z
High-Z
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
SW_OPEN
(Output)
Switch Status
Charge
Current
LOW
High-Z
LOW
High-Z
Connected
Charge with
100mA/
Change the
input current
based on
enumeration
Not Connected
Charge with
100 mA
Connected
Charge with full
current
Not Connected
Charge with
100 mA
High-Z
Not Connected
Charge with full
current
High-Z
High-Z
High-Z
Not Connected
Charge with full
current
Not Connected
Charge with full
current
Not Connected
Charge with
100 mA
High-Z
Not Connected
Charge with
100 mA
High-Z
Not Connected No Charge
High-Z
Not Connected No Charge
If a charger has been detected and the GOOD_BAT pin is low, a Dead Battery Provision (DBP) timer is initiated.
If the GOOD_BAT continues to be low for 30 minutes (maximum of 45 minutes), charging is disabled and
CHG_AL_N goes into the High-Z state to indicate this. Toggling GOOD_BAT high after the DBP timer expires re-
starts detection and the DBP timer.
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