isp1302 NXP Semiconductors, isp1302 Datasheet - Page 10

• Manufacturer Part Number: isp1302
• Description: Isp1302 Universal Serial Bus On-the-go Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1302_1
Product data sheet
7.5 Pull-up and pull-down resistors
Table 4.
Figure 6
connected to the DP and DM lines. The DP pull-up resistor (SW1) is controlled by
bit DP_PULLUP of the OTG Control register.
The pull-up resistor is context variable as described in document ECN_27%_Resistor .
The pull-up resistor value depends on the USB bus condition:
DP also implements a weak pull-up resistor (R
bit DP_WKPU_EN of the Misc Control register.
The DP pull-down resistor (R
the OTG Control register is set.
The DM pull-down resistor (R
the OTG Control register is set.
ID_PULLDN PH_ID_ACK PH_ID_INT Switch between ID and ground
0
0
0
0
1
•
•
When the bus is idle, the resistor is 900
When the bus is transmitting or receiving, the resistor is 1425
(SW2 = off).
shows the switchable pull-up and pull-down resistors that are internally
ID pull-down control
0
0
1
1
X
Rev. 01 — 24 May 2007
0
1
0
1
X
DN(DP)
DN(DM)
) is connected to the DP line, if bit DP_PULLDOWN in
) is connected to the DM line, if bit DM_PULLDOWN in
off
on for time t
autoclears to 0
wait for time t
then off and bit PH_ID_ACK autoclears to 0
not defined
on
USB OTG transceiver with carkit support
weakUP(DP)
to 1575
PH_ID_INT
PH_ID_WT
) that is controlled using
(SW2 = on).
, then off and bit PH_ID_INT
, turn on the switch for t
to 3090
© NXP B.V. 2007. All rights reserved.
ISP1302
PH_ID_INT
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