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ISP1110VH Datasheet(PDF) 8 Page - NXP Semiconductors |
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ISP1110VH Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 26 page  ISP1110_2 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 02 — 19 March 2007 7 of 25 NXP Semiconductors ISP1110 USB transceiver with UART signaling 3. If the phone is switched off (VCC(I/O) is not present), then the DP and DM pins of the ISP1110 remain at high-impedance and the PC will not detect any device attachment. 4. If the phone is switched on (VCC(I/O) is present), then the ISP1110 will drive the VBUSDET pin to a HIGH level. 5. The phone processor detects that pin VBUSDET is HIGH. If the phone system software is ready for USB operation, the phone processor will assert pin SOFTCON. 6. The ISP1110 will enable the DP pull-up resistor (RPU(DP)). 7. The PC detects DP at the HIGH level and starts the USB full-speed enumeration. 8. The PC loads the driver for the phone, if enumeration is successful. For the flowchart, see Section 7.1.3. 7.1.2 UART mode When the ISP1110 is in UART mode, the DP and DM driver is powered by 2.8 V. The ISP1110 works as a level shifter between these pairs of pins: • From TXD (VCC(I/O) level) to DM (2.8 V level). • From DP (2.8 V level) to RXD (VCC(I/O) level). When the ISP1110 is in UART mode, the USB differential receiver is disabled. The SUSPEND and SOFTCON input pins are ignored. The RCV pin is driven LOW. The VP/VPO and VM/VMO pins are driven LOW, if OE_N is HIGH. The VP/VPO and VM/VMO pins are 3-state LOW, if OE_N is LOW. The ISP1110 is in UART mode when VCC(5V0) < VCC(5V0)th and pin UART_EN is HIGH. VCC(I/O) and VCC(UART) must be on. A short description of the UART detection sequence is: 1. The phone is switched on (VCC(I/O) is present). 2. If VBUS is off, the ISP1110 will drive VBUSDET to a LOW level. The ATX is powered by 2.8 V. 3. The ISP1110 will enter UART signaling mode, if UART_EN is HIGH. For the flowchart, see Section 7.1.3. |
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