TPS25810-Q1_17 Datasheet, PDF (15/39 Pages) Texas Instruments – USB Type-C DFP Controller and Power Switch With Load Detection

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TPS25810-Q1
SLVSD95 – NOVEMBER 2016
Feature Description (continued)
7.3.1 Configuration Channel Pins CC1 and CC2
The TPS25810-Q1 device has two pins, CC1 and CC2, that serve to detect an attachment to the port and to
resolve cable orientation. These pins are also used to establish the current broadcast to a valid UFP, configure
V_CONN, and detect attachment of a debug or audio-adapter accessory.
Table 2 lists the TPS25810-Q1 response to various attachments to its port.
Table 2. TPS25810-Q1 Response
TPS25810-Q1 TYPE-C PORT
CC1
Nothing attached
UFP connected
UFP connected
Powered cable, no UFP
connected
Powered cable, no UFP
connected
Powered cable, UFP
connected
Powered cable, UFP
connected
Debug accessory connected
Audio-adapter accessory
connected
OPEN
Rd
OPEN
OPEN
Ra
Rd
Ra
Rd
Ra
CC2
OPEN
OPEN
Rd
Ra
OPEN
Ra
Rd
Rd
Ra
OUT
OPEN
IN1
IN1
OPEN
OPEN
IN1
IN1
OPEN
OPEN
V_CONN
on CC1 or
CC2
NO
NO
NO
NO
TPS25810-Q1 RESPONSE⁽¹⁾
POL
UFP
Hi-Z
Hi-Z
LOW
Hi-Z
Hi-Z
LOW
LOW
Hi-Z
NO
Hi-Z
Hi-Z
CC2
Hi-Z
LOW
CC1
NO
NO
LOW
Hi-Z
Hi-Z
LOW
Hi-Z
Hi-Z
AUDIO
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
LOW
DEBUG
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
LOW
Hi-Z
(1) POL, UFP, AUDIO, and DEBUG are open-drain outputs; pull high with 100 kΩ to AUX when used. Tie to GND or leave open when not
used.
7.3.2 Current Capability Advertisement and Overload Protection
The TPS25810-Q1 device supports all three Type-C current advertisements as defined by the USB Type-C
standard. Current broadcast to a connected UFP is controlled by the CHG and CHG_HI pins. For each broadcast
level, the device protects itself from a UFP that draws current in excess of the USB Type-C current
advertisement of that port by setting the current limit as shown in Table 3.
CHG
0
0
1
1
CHG_HI
0
1
0
1
Table 3. USB Type-C Current Advertisement
CC CAPABILITY
BROADCAST
STD
STD
1.5 A
3A
CURRENT LIMIT (TYP)
1.7 A
1.7 A
1.7 A
3.4 A
LOAD DETECT
THRESHOLD (TYP)
NA
NA
NA
1.95 A
Under OUT overload conditions, an internal OUT current-limit regulator limits the output current to the selected
I_LIM based on CHG and CHG_HI selection. In applications where V_CONN is supplied via CC1 or CC2, separate
fixed current-limit regulators protect these pins from overload at the level indicated in the Electrical
Characteristics table. When an overload condition is present, the device maintains a constant output current, with
the output voltage determined by (I_OS × R_LOAD). Two possible overload conditions can occur. The first overload
condition occurs when either: 1) input voltage is first applied, enable is true, and a short circuit is present (load
which draws I_OUT > I_OS), or 2) input voltage is present and the TPS25810-Q1 device is enabled into a short
circuit. The output voltage is held near zero potential with respect to ground and the TPS25810-Q1 device ramps
the output current to I_OS. The TPS25810-Q1 device limits the current to I_OS until the overload condition is
removed or the device begins to thermal cycle. This is demonstrated in Figure 24 where the device was enabled
into a short, and subsequently cycles current off and on as the thermal protection engages.
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