參數(shù)資料
型號: ISP1109
廠商: NXP Semiconductors N.V.
英文描述: Universal Serial Bus transceiver with carkit support
中文描述: 與車載通用串行總線收發(fā)器支持
文件頁數(shù): 12/59頁
文件大小: 295K
代理商: ISP1109
9397 750 13355
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 14 July 2005
12 of 59
Philips Semiconductors
ISP1109
USB transceiver with carkit support
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
BUS
voltage goes above the
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
bit PWR_DN within 5 ms from the time pin INT_N is asserted. For details,
see
Section 10
).
Pin ISET will remain LOW when V
CC
is below V
th(ISET)
. Pin ISET can also be controlled by
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.
7.9 USB transceiver
7.9.1
Differential driver
The operation of the driver is described in
Table 6
.
[1]
Include the internal power-on-reset pulse (active HIGH).
Table 7
shows the behavior of the transmit operation in detail.
Table 6:
Pin
RESET_N
[1]
HIGH
Transceiver driver operating setting
Pin or bit
SUSPEND
OE_N
LOW
0
Bit DAT_SE0
Differential driver
0
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
HIGH
LOW
0
1
HIGH
LOW
1
X
HIGH
LOW
HIGH
X
X
X
X
X
Table 7:
USB mode
USB functional mode: transmit operation
Inputs
DAT/VP
LOW
HIGH
LOW
HIGH
LOW
Outputs
DP
LOW
HIGH
LOW
LOW
LOW
SE0/VM
LOW
LOW
HIGH
HIGH
LOW
DM
HIGH
LOW
LOW
LOW
LOW
DAT_SE0
DAT_SE0
DAT_SE0
DAT_SE0
VP_VM
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