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FUSB1501MHX Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FUSB1501MHX Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 15 page © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FUSB1500 / FUSB1501 • Rev. 1.0.0 11 Functional Description (Continued) Extended Control Mode This block of control has a multi-function role; it is used to signal a SE0 detect to the host via INT_N and uses a weak resistor pull-up method for charger detection. Note that the signaling of SE0 via INT_N is only enabled for the state “011” and all SE0 events can still be decoded from the VP, VM, and RCV outputs. When the three inputs (SUSPND, CONFIG, and SPEED_N) are not “011,” INT_N is not active; the SE0 detector (RCV = 0) is not active and its latch is set to HIGH. When the “011” is seen on the inputs, the FUSB1500/1501 is waiting for an SE0 event. When the SE0 event (deglitched) is detected, INT_N goes active (HL transition). The host detects this INT_N signal and configures the inputs to the pattern “110” or “010” to keep the 1.5k Ω pull-up enabled. The INT_N signal is then de-asserted and the SE0 detector reset. If a code other than “010” or “110” is written, the mode configuration is a function as described in Table 4 and the SE0 detector and INT_N are de-asserted to reset states. When entering the state “111,” which enables the weak pull up resistor for charger detection, the D+/D- drivers are automatically configured to USB receive mode (equivalent to OE_N HIGH). Figure 10 shows the extended control logic and Table 4 the truth table for the extended control. Figure 10. Extended Control Function Table 4. Extended Control Hi-Z SUSPND CONFIG SPEED_N Function 0 0 0 0 No 1.5k Ω Pull-up FS USB Mode, Default State 0 0 1 0 1.5k Ω Pull-up FS USB Mode 0 0 0 1 No 1.5k Ω Pull-up LS USB Mode 0 0 1 1 Pull-up On After Detecting SE0 FS Suspend, Conditional Pull-up 0 1 0 0 No 1.5k Ω Pull-up FS Suspend 0 1 1 0 1.5k Ω Pull-up FS Suspend 0 1 0 1 No 1.5k Ω Pull-up LS Suspend 0 1 1 1 No 1.5k Ω Pull-up, 125kΩ Pull-up Connected USB Rx Mode & RWPU On 1 X X X VP, VM, D+, D-, RCV High Impedance, SW1 and SW2 Open Hi-Z Mode |
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