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參數資料
| 型號： | ISP1501 |
| 英文描述： | Hi-Speed Universal Serial Bus peripheral transceiver |
| 中文描述： | 高速通用串行總線外設收發器 |
| 文件頁數： | 11/40頁 |
| 文件大小： | 770K |
| 代理商： | ISP1501 |
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Philips Semiconductors
ISP1501
Hi-Speed USB peripheral transceiver
Product data
Rev. 02 — 21 November 2002
11 of 40
9397 750 10025
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
8.2.2
Full-speed (FS) state
In the full-speed (FS) state (MODE[1:0] = 01), an external pull-up resistor of
1.5 k
±
5% is required on the DP line. This is implemented via the RPU resistor. The
RPU resistor is internally connected to the DP line. The FS transceiver is enabled,
and the legacy (Original USB) SIE interface is active (see
Figure 4
).
8.2.3
High-speed (HS) state
In the high-speed (HS) state, internal 45
resistors on the DP and DM lines are
connected to the ground. The pull-up resistor is disconnected. The HS transceiver is
enabled, and the parallel interface and the HS-handshake signals are used (see
Figure 5
).
8.2.4
High-speed (HS) chirp state
In the high-speed (HS) chirp state, 45
terminations are disabled from the
DP and DM lines. The pull-up resistor is connected on the DP line. The
HS transceiver is enabled, and the parallel interface and HS handshake signals are in
use (see
Figure 6
).
Fig 4.
Full-speed state.
004aaa052
7
9
6 DM
DP
ISP1501
45
45
1.5 k
±
5%
3.3 V
RPU
FS driver
Fig 5.
High-speed state.
004aaa041
7
9
6 DM
DP
ISP1501
45
45
1.5 k
±
5%
3.3 V
RPU
HS current
driver
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