ISP1507B1HNTM STEricsson, ISP1507B1HNTM Datasheet - Page 10

• Manufacturer Part Number: ISP1507B1HNTM
• Manufacturer: STEricsson

Specifications of ISP1507B1HNTM

• Lead Free Status / RoHS Status: Compliant

CD00269905
Product data sheet
8.6.2.1 V
8.6.2.2 Session valid comparator
8.6.2.3 Session end comparator
8.6.1 ID detector
8.6.2 V
8.6.3 SRP charge and discharge resistors
8.7 Band gap reference voltage
The ID detector detects which end of the micro-USB cable is plugged in. The detector
must first be enabled by setting the ID_PULLUP register bit to logic 1. If the ISP1507x1
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 ISP1507x1 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 4.4 V. Any voltage on 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 ISP1507x1 is
V
The ISP1507x1 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 ISP1507x1 is V
The ISP1507x1 provides on-chip resistors for short-term charging and discharging of
V
restore the V
the 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 band gap circuit provides a stable internal voltage reference to bias the analog
circuitry. The band gap requires an accurate external reference, R
connected between the RREF pin and GND. For details, see
•
•
BUS
BUS
B_SESS_VLD
BUS
BUS
If the micro-B end of the cable is plugged in, the ISP1507x1 will report that ID_GND is
logic 1. The USB link must change to peripheral mode.
If the micro-A end of the cable is plugged in, the ISP1507x1 will report that ID_GND is
logic 0. The USB link must change to host mode.
. These are used by the B-device to request a session, prompting the A-device to
is at a valid level for operation. The ISP1507x1 minimum threshold for the V
valid comparator
comparators
, with a hysteresis of V
BUS
power. First, the B-device makes sure that V
Rev. 03 — 26 July 2010
hys(B_SESS_VLD)
BUS
ISP1507A1; ISP1507B1
below this threshold is considered invalid.
BUS
BUS
.
BUS
valid comparator, session valid
is charged above the session valid
power.
BUS
B_SESS_END
BUS
ULPI HS USB OTG transceiver
by setting the CHRG_VBUS
BUS
voltage level.
Section
BUS
is below the B-device
is fully discharged from
RREF
.
© ST-ERICSSON 2010. All rights reserved.
17.
, resistor
BUS
is high
BUS
10 of 78
valid