ISP1506ABS-T ST-Ericsson Inc, ISP1506ABS-T Datasheet - Page 9

• Manufacturer Part Number: ISP1506ABS-T
• Description: IC USB TXRX HS 24-HVQFN
• Manufacturer: ST-Ericsson Inc
• Type: Transceiverr

Specifications of ISP1506ABS-T

• Number Of Drivers/receivers: 1/1
• Protocol: USB 2.0
• Voltage - Supply: 1.65 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-VQFN Exposed Pad, 24-HVQFN, 24-SQFN, 24-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
ISP1506A_ISP1506B_1
Product data sheet
7.6.2.1 V
7.6.2.2 Session valid comparator
7.6.2.3 Session end comparator
7.6.1 ID detector
7.6.2 V
7.6.3 SRP charge and discharge resistors
7.6.4 Charge pump
The ID detector detects which end of the mini-USB cable is plugged in. The detector must
first be enabled by setting the ID_PULLUP register bit to logic 1. If the ISP1506 senses a
value on ID that is different from the previously reported value, an RXCMD status update
will be sent to the USB link, or an interrupt will be asserted.
The ISP1506 provides three comparators, V
comparator and session end comparator, to detect the V
This comparator is used by hosts and A-devices to determine whether the voltage on
V
comparator is V
During power-up, it is expected that the comparator output will be ignored.
The session valid comparator is a TTL-level input that determines when V
enough for a session to start. Peripherals, A-devices and B-devices use this comparator to
detect when a session is started. The A-device also uses this comparator to determine
when a session is completed. The session valid threshold of the ISP1506 is V
with a hysteresis of V
The ISP1506 session end comparator determines when V
session end threshold. The B-device uses this threshold to determine when a session has
ended. The session end threshold of the ISP1506 is V
The ISP1506 provides on-chip resistors for short-term charging and discharging of V
These are used by the B-device to request a session, prompting the A-device to restore
the V
previous session by setting the DISCHRG_VBUS register bit to logic 1 and waiting for
SESS_END to be logic 1. Then the B-device charges V
register bit to logic 1. The A-device sees that V
threshold and starts a session by turning on the V
The ISP1506 uses a built-in charge pump to supply current to V
of 5 V. The charge pump works as a capacitive DC-DC converter. An external holding
capacitor, C
•
•
•
BUS
BUS
BUS
Charge pump to provide 5 V power on V
power from the ISP1506 V
If the mini-B end of the cable is plugged in, the ISP1506 will report that ID_GND is
logic 1. The USB link must change to peripheral mode.
If the mini-A end of the cable is plugged in, the ISP1506 will report that ID_GND is
logic 0. The USB link must change to host mode.
BUS
is at a valid level for operation. The ISP1506 minimum threshold for the V
valid comparator
comparators
power. First, the B-device makes sure that V
cp(C_A)-(C_B)
A_VBUS_VLD
hys(B_SESS_VLD)
, is required between the C_A and C_B pins as shown in
Rev. 01 — 30 May 2007
. Any voltage on V
BUS
.
.
BUS
BUS
BUS
ISP1506A; ISP1506B
BUS
. The downstream peripheral can draw its
valid comparator, session valid
below V
BUS
is charged above the session valid
BUS
power.
B_SESS_END
BUS
BUS
A_VBUS_VLD
ULPI HS USB OTG transceiver
is fully discharged from the
BUS
by setting the CHRG_VBUS
voltage level.
is below the B-device
BUS
.
at a nominal voltage
is considered a fault.
© NXP B.V. 2007. All rights reserved.
BUS
B_SESS_VLD
is high
BUS
Figure
valid
9 of 79
BUS
3,
.
,