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ISP1302HN Datasheet(PDF) 11 Page - NXP Semiconductors |
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ISP1302HN Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 64 page ISP1302_1 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 01 — 24 May 2007 10 of 63 NXP Semiconductors ISP1302 USB OTG transceiver with carkit support 7.5 Pull-up and pull-down resistors Figure 6 shows the switchable pull-up and pull-down resistors that are internally 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: • When the bus is idle, the resistor is 900 Ω to 1575 Ω (SW2 = on). • When the bus is transmitting or receiving, the resistor is 1425 Ω to 3090 Ω (SW2 = off). DP also implements a weak pull-up resistor (RweakUP(DP)) that is controlled using bit DP_WKPU_EN of the Misc Control register. The DP pull-down resistor (RDN(DP)) is connected to the DP line, if bit DP_PULLDOWN in the OTG Control register is set. The DM pull-down resistor (RDN(DM)) is connected to the DM line, if bit DM_PULLDOWN in the OTG Control register is set. Table 4. ID pull-down control ID_PULLDN PH_ID_ACK PH_ID_INT Switch between ID and ground 000 off 0 0 1 on for time tPH_ID_INT, then off and bit PH_ID_INT autoclears to 0 0 1 0 wait for time tPH_ID_WT, turn on the switch for tPH_ID_INT, then off and bit PH_ID_ACK autoclears to 0 0 1 1 not defined 1X X on |
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