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STULPI01A 数据表(PDF) 19 Page - STMicroelectronics

部件名 STULPI01A
功能描述  High speed USB On-The-Go ULPI transceiver
PDF  44 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STULPI01A 数据表(HTML) 19 Page - STMicroelectronics

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STULPI01A - STULPI01B
Block description
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6.6
External charge pump
It is possible to use an external charge pump or power switch controlled by the PSWn pin
(active low open drain). This functionality is controlled by DrvVbus and DrvVbusExternal
ULPI OTG Control register bits.
6.7
VBUS comparators and VBUS over current (OC) detector
These comparators monitor the VBUS voltage.
VBUS valid status signalizes that the voltage is above the VBUS_VLD level (4.4 V). Session
valid status signalizes that the VBUS voltage is above the VSESS_VLD level (0.8 to 2.0 V).
Session end detector signalizes VBUS voltage is below VSESS_END level.
STULPI01 also implements embedded VBUS over current detector which compares VBUS
voltage to external analog 5 V reference signal applied to VB_REF_FAULT pin.
6.8
VB_REF_FAULT pin
VBUS over-current conditions can be monitored by either internal or an external OC detector.
The internal OC detector is enabled when over-current_PD bit in the Power Control register
(Vendor-specific area) is set to 0b and Use External VBUS Indicator is set to 1b. In this
mode, the VB_REF_FAULT pin functions as the input of the analog reference for internal
over-current detector.
If the external charge pump is already equipped with an over-current detector, its output can
be also monitored through VB_REF_FAULT pin, but over-current_PD bit must be set to 1b.
In this mode VB_REF_FAULT will function as standard digital input pin with 5 V tolerance.
Functionality of VB_REF_FAULT pin can be seen in more detail (on Figure 6).
Note:
After reset, over-current_PD bit is 1b, internal over-current detector is disabled.
Figure 6.
VB_REF_FAULT pin functionality
+
-
REF
VBREF_FAULT
Internal VBUS Valid
VBUSVLD
[UseExternalVbusIndicator, IndicatorPassthru]
RX CMD VBUS Valid
2
0
1
[0,X]
[1,0]
[1,1]
BUS
VB
REF
V
BUS
SCHMIT
(5 V TOLERANT)
VBUS
FAULT
+
-
VBOC
EN
/EN
+
-
Valid
IndicatorComplement
OverCurrent_PD or neg (UseExternalVbusIndicator)
0
1
[0,X]
[1,1]
V
V
VBUS
+
-
VBOC
RIN_VBREF
+
-
REF
VBREF_FAULT
Internal VBUS Valid
VBUSVLD
[UseExternalVbusIndicator, IndicatorPassthru]
RX CMD VBUS Valid
2
0
1
[0,X]
[1,0]
[1,1]
BUS
VB
REF
V
BUS
SCHMIT
(5 V TOLERANT)
VBUS
FAULT
+
-
VBOC
EN
/EN
+
-
Valid
IndicatorComplement
OverCurrent_PD or neg (UseExternalVbusIndicator)
0
1
[0,X]
[1,1]
V
V
VBUS
+
-
VBOC
RIN_VBREF



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