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): 10/59頁
文件大?。?/td> 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
10 of 59
Philips Semiconductors
ISP1109
USB transceiver with carkit support
The DP pull-down resistor (R
DN(DP)
) is connected to the DP line, if bit DP_PULLDOWN in
the Resistor Control register is set.
The DM pull-down resistor (R
DN(DM)
) is connected to the DM line, if bit DM_PULLDOWN
in the Resistor Control register is set.
7.5 Power block
The built-in DC-DC regulator conditions the input power supply (V
CC
) for use in the core of
the ISP1109.
When V
CC
is greater than 3.6 V, the regulator will output 3.3 V
±
10 %. When V
CC
is less
than 3.6 V, the regulator will be bypassed and pin REG3V3 will be shorted to pin V
CC
.
The output of the regulator can be monitored on pin REG3V3. A capacitor (0.1
μ
F) will be
connected to pin REG3V3.
7.6 Carkit DP interrupt detector
The carkit DP interrupt detector is a comparator that detects the carkit interrupt signal on
the DP line in analog audio mode. Bit DP_INT will be cleared (set to logic 0), if the voltage
level on the DP line is below the carkit interrupt threshold V
thPH(DP)L
(0.4 V to 0.6 V).
The carkit interrupt detector is enabled in audio mode only (bit AUDIO_EN = 1).
Fig 4.
DP and DM pull-up and pull-down resistors.
004aaa520
REG3V3
SW2
SW1
130 k
± 30 %
0.525 k
to
1.515 k
0.9 k
to
1.575 k
15 k
(14.3 k
to
24.8 k
)
DP_PULLDOWN
DM_PULLDOWN
15 k
(14.3 k
to
24.8 k
)
SW3
DP
DM
RDN(DM)
RDN(DP)
RweakUP(DP)
相關(guān)PDF資料
PDF描述
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