BQ25600 Datasheet, PDF (20/66 Pages) Texas Instruments – I2C Controlled 3.0-A, Single Cell Battery Charger With up-to 40-V Overvoltage Protection Controller for High-Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25600, bq25600D
SLUSCJ4 – JUNE 2017
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Feature Description (continued)
The host can over-write IINDPM register to change the input current limit if needed. The charger input current is
always limited by the IINDPM register.
7.3.3.4.1 D+/D– Detection Sets Input Current Limit inbq25600D
The bq25600D contains a D+/D– based input source detection to set the input current limit at VBUS plug-in. The
D+/D– detection includes standard USB BC1.2 and non-standard adapter. When input source is plugged in, the
device starts standard USB BC1.2 detections. The USB BC1.2 is capable to identify Standard Downstream Port
(SDP) and Dedicated Charging Port (DCP). When the Data Contact Detection (DCD) timer expires, the non-
standard adapter detection is applied to set the input current limit. The non-standard detection is used to
distinguish vendor specific adapters (Apple and Samsung) based on their unique dividers on the D+/D– pins. If
an adapter is detected as DCP, the input current limit is set at 2.4 A. If an adapter is detected as unknown, the
input current limit is set at 0.5 A
Non-Standard
Adapter
Divider 1
Divider 2
Divider 3
Divider 4
Table 1. Non-Standard Adapter Detection
D+ Threshold
V_D+ within V_{2P7_VTH}
V_D+ within V_{1P2_VTH}
V_D+ within V_{2P0_VTH}
V_D+ within V_{2P7_VTH}
D– Threshold
V_D– within V_{2P0_VTH}
V_D– within V_{1P2_VTH}
V_D– within V_{2P7_VTH}
V_D– within V_{2P7_VTH}
Input Current Limit (A)
2.1
2
1
2.4
Table 2. Input Current Limit Setting from D+/D– Detection
D+/D– Detection
USB SDP (USB500)
USB DCP
Divider 3
Divider 1
Divider 4
Divider 2
Unknown 5-V Adapter
Input Current Limit (IINLIM)
500 mA
2.4 A
1A
2.1 A
2.4 A
2A
500mA
7.3.3.4.2 PSEL Pins Sets Input Current Limit in bq25600
The bq25600 has PSEL pin for input current limit setting to interface with USB PHY. It directly takes the USB
PHY device output to decide whether the input is USB host or charging port. When the device operates in host-
control mode, the host needs to IINDET_EN bit to read the PSEL value and update the IINDPM register. When
the device is in default mode, PSEL value updates IINDPM in real time.
Input Detection
USB SDP
Adapter
Table 3. Input Current Limit Setting from PSEL
PSEL Pin
High
Low
INPUT CURRENT LIMIT
(ILIM)
500 mA
2.4A
VBUS_STAT
001
011
7.3.3.5 Input Voltage Limit Threshold Setting (VINDPM Threshold)
The device supports wide range of input voltage limit (3.9 V – 5.4V) for USBThe device's VINDPM is set at 4.5V.
The device supports dynamic VINDPM trackingsettings which tracks the battery voltage. This function can be
enabled via the VDPM_BAT_TRACK[1:0] register bits. When enabled, the actual input voltage limit will be the
higher of the VINDPM register and VBAT + VDPM_BAT_TRACK offset.
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