isp1109 NXP Semiconductors, isp1109 Datasheet - Page 12

• Manufacturer Part Number: isp1109
• Description: Universal Serial Bus Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13355
Product data sheet
7.9.1 Differential driver
7.9 USB transceiver
Pin ISET will remain LOW when V
software through register bits. If bit ISET_DRV_EN is set to logic 1, the status of the ISET
pin will be determined by bit ISET_STATE.
The operation of the driver is described in
Table 6:
[1]
Table 7
Table 7:
Pin
RESET_N
HIGH
HIGH
HIGH
HIGH
LOW
USB mode
DAT_SE0
DAT_SE0
DAT_SE0
DAT_SE0
VP_VM
•
If the Power-down is because of the setting of register bit PWR_DN in the Mode
Control register, the bias will be enabled if the V
SESS_VLD threshold. Note: In this case, make sure bit SESS_VLD_IEH in the
Interrupt Enable High register is set to logic 1 before the PWR_DN bit is set. The
recommended sequences for software is:
a. Set bit SESS_VLD_IEH to logic 1
b. Set bit PWR_DN to logic 1
c. Wait for interrupt from the ISP1109
d. If INT_N is asserted, read the Interrupt Latch register
e. If bit SESS_VLD_INT is logic 1, clear bit PWR_DN (Note: Software must clear
Include the internal power-on-reset pulse (active HIGH).
bit PWR_DN within 5 ms from the time pin INT_N is asserted. For details,
see
shows the behavior of the transmit operation in detail.
[1]
Transceiver driver operating setting
USB functional mode: transmit operation
Section
OE_N
LOW
LOW
LOW
HIGH
X
Inputs
DAT/VP
LOW
HIGH
LOW
HIGH
LOW
10).
Pin or bit
SUSPEND
0
0
1
X
X
Rev. 01 — 14 July 2005
CC
SE0/VM
LOW
LOW
HIGH
HIGH
LOW
is below V
Bit DAT_SE0
0
1
X
X
X
Table
th(ISET)
6.
USB transceiver with carkit support
BUS
. Pin ISET can also be controlled by
Outputs
DP
LOW
HIGH
LOW
LOW
LOW
Differential driver
output value from DAT/VP to DP and
SE0/VM to DM
output value from DAT/VP to DP and
DM, if SE0/VM is LOW; otherwise,
drive both DP and DM LOW
output value from DAT/VP to DP and
DM
high-Z
high-Z
voltage goes above the
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
DM
HIGH
LOW
LOW
LOW
LOW
ISP1109
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