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ISL54227 датащи(PDF) 10 Page - Intersil Corporation

номер детали ISL54227
подробное описание детали  High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection
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производитель  INTERSIL [Intersil Corporation]
домашняя страница  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL54227 датащи(HTML) 10 Page - Intersil Corporation

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ISL54227
10
FN7593.0
July 2, 2010
With a negative -5V fault voltage at both com pins, the
graph in Figure 7 shows the IDD current draw for
different external resistor values for supply voltages of
2.7V, 3.6V, and 5.25V. Note: With a 500Ω resistor the
current draw is limited to around 5mA. When the
negative fault voltage is removed the IDD current will
return to it’s normal operation current of 25µA to 45µA.
The series resistor also provides improved ESD and
latch-up immunity. During an overvoltage transient event
(such as occurs during system level IEC 61000 ESD
testing), substrate currents can be generated in the IC
that can trigger parasitic SCR structures to turn ON,
creating a low impedance path from the VDD power
supply to ground. This will result in a significant amount
of current flow in the IC, which can potentially create a
latch-up state or permanently damage the IC. The
external VDD resistor limits the current during this
overstress situation and has been found to prevent latch-
up or destructive damage for many overvoltage transient
events.
Under normal operation, the low microamp IDD current
of the IC produces an insignificant voltage drop across
the series resistor resulting in no impact to switch
operation or performance.
CHARGER PORT DETECTION
The ISL54227 has special charger port detection circuitry
that monitors the voltage at the com pins to detect when
a battery charger has been connected into the USB port
(see Figure 8).
When the battery charger is connected into the USB
connector, it shorts the COM+ and COM- pins together.
The shorting of the pins is sensed by the ISL54227 IC
and it pulls the COM+ and COM- lines high and as long as
the OE = “0” or is tri-stated by the µP, it will drive its INT
logic output “Low” to tell the power management
circuitry that a battery charger is connected at the port
and not a USB host transceiver. The power management
circuitry will then use the USB connector VBUS line to
charge the battery.
ISL54227 Operation
The following will discuss using the ISL54227 shown in
the “Application Block Diagram” on page 8.
POWER
The power supply connected at the VDD pin provides the
DC bias voltage required by the ISL54227 part for proper
operation. The ISL54227 can be operated with a VDD
voltage in the range of 2.7V to 5.25V.
For lowest power consumption you should use the lowest
VDD supply.
A 0.01µF or 0.1µF decoupling capacitor should be
connected from the VDD pin to ground to filter out any
power supply noise from entering the part. The capacitor
should be located as close to the VDD pin as possible.
In a typical application, VDD will be in the range of
2.8V to 4.3V and will be connected to the battery or
LDO of the portable media device.
LOGIC CONTROL
The state of the ISL54227 device is determined by the
voltage at the OE pin, LP pin, and the signal voltage at
the COM pins. Refer to “Truth Table” on page 2.
FIGURE 6. VDD SERIES RESISTOR TO LIMIT IDD
CURRENT DURING NEGATIVE OVP AND FOR
ENHANCED ESD AND LATCH-UP IMMUNITY
FIGURE 7. NEGATIVE OVP IDD CURRRENT vs
RESISTOR VALUE vs VSUPPLY
D+
100Ω TO 1kΩ
COM+
COM-
VSUPPLY
GND
C
PROTECTION
RESISTOR
OVP
LOGIC
D-
IDD
VDD
-5V
FAULT
VOLTAGE
ALM
INT
LOW
TO
INDICATE
OVP
OE
LP
0
5
10
15
20
25
100 200 300 400 500 600 700 800 900 1k
RESISTOR (Ω)
VCOM+ = VCOM- = -5V
2.7V
3.6V
5.25V
FIGURE 8. CHARGER PORT DETECTION
OE
D+ COM+
COM-
VSUPPLY
GND
C
LOGIC
D-
LP
VDD
ALM
INT
USB
TRANCEIVER
BATTERY
CHARGER
µP
200Ω
CHG DET
POWER
BATTERY CHARGER
CIRCUITRY
MANAGEMENT
“LOW” TO
INDICATE
CHARGER
CONNECTED
OE = “0”
OR
TRI-STATE
VBUS
GND
D+
D-


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