isp1302 NXP Semiconductors, isp1302 Datasheet - Page 17

• 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
The first function of the ADR/PSW pin is to set the I
the RESET_N pin, the level on ADR/PSW is latched and stored in ADR_REG, which
represents the Least Significant Bit (LSB) of the I
I
address for the ISP1302 is 010 1101 (2Dh). The power-on reset value of ADR_REG = 0.
The second function of the ADR/PSW pin is to control an external charge pump. The
ADR/PSW pin can be programmed as an active HIGH or active LOW PSW output. The
polarity of the PSW output is determined by ADR_REG. If ADR_REG = 0, then PSW will
be active HIGH; if ADR_REG = 1, then PSW will be active LOW. The PSW output will be
enabled only when Mode Control 2 register bit PSW_OE = 1. By default, PSW can only
drive HIGH if the hardware reset pulse is not issued on RESET_N.
The combinations of I
Table
Table 9.
The ISP1302 built-in charge pump supports V
needs more current support, an external charge pump may be needed. In this case, the
ADR/PSW pin can act as a power switch for the external charge pump.
an example of using an external charge pump.
ADR/PSW level on the rising
edge of RESET_N
LOW
HIGH
2
Fig 10. Using an external charge pump
C-bus address for the ISP1302 is 010 1100 (2Ch); if ADR_REG = 1, the I
VREG
9.
ISP1302
Possible combinations of I
ADR/PSW
V
BUS
2
C-bus address and the PSW polarity are limited, as shown in
Rev. 01 — 24 May 2007
100 k
I
2Ch
2Dh
2
C-bus address
V
ON/OFF
BAT
2
C-bus address and the PSW polarity
V
IN
CHARGE PUMP
USB OTG transceiver with carkit support
BUS
2
C-bus address. If ADR_REG = 0, the
current at 50 mA. If the application
2
C-bus address. On the rising edge of
V
OUT
PSW polarity
active HIGH
active LOW
4.7 F
V
BUS
© NXP B.V. 2007. All rights reserved.
Figure 10
ISP1302
CONNECTOR
2
C-bus
USB
004aaa659
shows
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