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ISP1506ABS Datasheet(PDF) 10 Page - NXP Semiconductors |
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ISP1506ABS Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 80 page  ISP1506A_ISP1506B_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 28 August 2008 9 of 79 NXP Semiconductors ISP1506A; ISP1506B ULPI HS USB OTG transceiver • Charge pump to provide 5 V power on VBUS. The downstream peripheral can draw its power from the ISP1506 VBUS. 7.6.1 ID detector The ID detector detects which end of the micro-USB cable is plugged in. The detector must first be enabled by setting the ID_PULLUP register bit to logic 1. If the ISP1506 senses a value on ID that is different from the previously reported value, an RXCMD status update will be sent to the USB link, or an interrupt will be asserted. • If the micro-B end of the cable is plugged in, the ISP1506 will report that ID_GND is logic 1. The USB link must change to peripheral mode. • If the micro-A end of the cable is plugged in, the ISP1506 will report that ID_GND is logic 0. The USB link must change to host mode. 7.6.2 VBUS comparators The ISP1506 provides three comparators, VBUS valid comparator, session valid comparator and session end comparator, to detect the VBUS voltage level. 7.6.2.1 VBUS valid comparator This comparator is used by hosts and A-devices to determine whether the voltage on VBUS is at a valid level for operation. The ISP1506 minimum threshold for the VBUS valid comparator is VA_VBUS_VLD. Any voltage on VBUS below VA_VBUS_VLD is considered invalid. During power-up, it is expected that the comparator output will be ignored. 7.6.2.2 Session valid comparator The session valid comparator is a TTL-level input that determines when VBUS is high enough for a session to start. Peripherals, A-devices and B-devices use this comparator to detect when a session is started. The A-device also uses this comparator to determine when a session is completed. The session valid threshold of the ISP1506 is VB_SESS_VLD, with a hysteresis of Vhys(B_SESS_VLD). 7.6.2.3 Session end comparator The ISP1506 session end comparator determines when VBUS is below the B-device session end threshold. The B-device uses this threshold to determine when a session has ended. The session end threshold of the ISP1506 is VB_SESS_END. 7.6.3 SRP charge and discharge resistors The ISP1506 provides on-chip resistors for short-term charging and discharging of VBUS. These are used by the B-device to request a session, prompting the A-device to restore the VBUS power. First, the B-device makes sure that VBUS is fully discharged from the previous session by setting the DISCHRG_VBUS register bit to logic 1 and waiting for SESS_END to be logic 1. Then the B-device charges VBUS by setting the CHRG_VBUS register bit to logic 1. The A-device sees that VBUS is charged above the session valid threshold and starts a session by turning on the VBUS power. 7.6.4 Charge pump The ISP1506 uses a built-in charge pump to supply current to VBUS at a nominal voltage of 5 V. The charge pump works as a capacitive DC-DC converter. An external holding capacitor, Ccp(C_A)-(C_B), is required between the C_A and C_B pins as shown in Figure 3, |
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