參數(shù)資料
型號(hào)： ISP1109BS
廠商： NXP SEMICONDUCTORS
元件分類： 通用總線功能
英文描述： Universal Serial Bus transceiver with carkit support
中文描述： LINE TRANSCEIVER, PQCC32
封裝： LEAD FREE, 5 X 5 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT617-1, HVQFN-32
文件頁(yè)數(shù)： 9/59頁(yè)
文件大小： 295K
代理商： ISP1109BS
9397 750 13355
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 14 July 2005
9 of 59
Philips Semiconductors
ISP1109
USB transceiver with carkit support
The ID detector has a switch that can be used to ground pin ID. This switch is controlled
by bit ID_PULLDN of the Resistor Control register, and bits PH_ID_INT and PH_ID_ACK
of the Audio Control register. See
Table 3
.
The ID detector also has a switch that is connected between the ID_PU and V
REF
pins. If
the voltage on the ID pin is higher than the voltage on the V
REF
pin, the switch will be
turned off. Otherwise, the switch will remain on.
7.4 Pull-up and pull-down resistors
The DP pull-up resistor can be enabled or disabled (default enabled) using register
bit DP_PULLUP, if V
BUS
is above V
th(svc)
. The pull-up resistance on pin DP (R
UP(DP)
) must
be enabled, if V
CC
> V
th(ISET)
and V
BUS
> V
th(svc)
.
To support DP Session Request Protocol (SRP), it is required that a B-device can perform
DP pulsing when V
BUS
is below the session end threshold (0.2 V to 0.8 V). If register
bit DP_SRP_EN is set, the DP pull-up resistor will be enabled irrespective of the status of
V
BUS
.
The pull-up resistor is context variable, as described in document ECN_27%_Resistor
The value of the pull-up resistor depends on the condition of the USB bus:
When the bus is idle, the value of the resistor is 900
to 1575
(SW2 = on).
When the bus is transmitting or receiving, the value of the resistor is 1425
to
3090
(SW2 = off).
DP also implements a weak pull-up resistor (R
weakUP(DP)
) that is controlled by
bit DP_WKPU_EN of the Resistor Control register; see
Figure 4
. R
weakUP(DP)
will be
connected to the DP pin (SW3 = on), if bit DP_WKPU_EN = 1 and the voltage on V
BUS
is
greater than V
th(svc)
.
Table 3:
ID_PULLDN
0
0
ID pull-down control
PH_ID_ACK
0
0
PH_ID_INT
0
1
Switch between ID and GND
off
on for time t
Wint(ID)
then off; bit PH_ID_INT
auto-clears to 0
wait for time t
int(ID)
, turn on the switch for t
Wint(ID)
then
off; bit PH_ID_ACK auto-clears to 0
not defined
on
0
1
0
0
1
1
X
1
X
Table 4:
Bit
DP_SRP_EN
0
0
0
0
0
1
DP pull-up resistor (R
UP(DP)
) control
V
BUS
> V
th(svc)
Pin
V
CC(I/O)
HIGH
X
X
LOW
X
HIGH
X
DP pull-up resistor (SW1)
DP_PULLUP
0
1
1
1
1
X
RESET_N
X
X
X
LOW
HIGH
HIGH
X
no
X
X
yes
X
off
off
off
off
on
on
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