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UCS2113 数据表(PDF) 21 Page - Microchip Technology |
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UCS2113 数据表(HTML) 21 Page - Microchip Technology |
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21 / 62 page  2016-2021 Microchip Technology Inc. and its subsidiaries DS20005680B-page 21 UCS2113 5.4 Discrete Output Pins 5.4.1 ALERT#1 AND ALERT#2 OUTPUT PINS The UCS2113 has two independent ALERT# out pins. ALERT#1 is tied to the status of the VBUS1 pin. ALERT#2 is tied to the status of the VBUS2 pin. The ALERT# pin is an active-low open-drain interrupt to the host controller. The ALERT# pin is asserted when an error occurs. Also, when charge rationing is enabled, the ALERT# pin is asserted by default when the current rationing threshold is reached (as determined by RATION_BEH<1:0>). The ALERT# pin is released when all error conditions that may assert the ALERT# pin (such as an error condition and charge rationing) have been removed or reset as necessary. The UCS2113 is compatible with the Microchip hub devices supporting single pin power control feature. These hub devices have a single connection to the PWR_EN and ALERT# pins of the UCS2113, which are tied together in the application. 5.4.2 BOOST# OUTPUT PIN The UCS2113 provides a BOOST# output pin to compensate for voltage drops during high loads. The BOOST# pin is an active-low, open-drain output that would be connected to a resistor in the DC-DC converter’s feedback error voltage loop (see Figure 5-3). The BOOST# pin is asserted when VBUS Current > IBOOST. IBOOST typical value is 1.9A. The BOOST# is OR’ed for both VBUS1 and VBUS2 ports. When the BOOST# pin is asserted, it will remain in this state for at least tBOOST_MAT (minimum assertion time). FIGURE 5-3: Boost# Pin Usage. 5.5 Discrete Input Pins 5.5.1 COMM_ILIM INPUT The COMM_ILIM input determines the communications mode, as shown in Table 6-1. This is also the hardware strap for MAX Current Limit. 5.5.2 SMCLK When operated in Stand-Alone mode, this pin should be tied to ground. When the UCS2113 is configured for SMBus communications, the SMCLK is the clock input. 5.5.3 SMDATA When used in Stand-Alone, this pin should be tied to ground. When the UCS2113 is configured for SMBus communications, the SMDATA is the data input/output. DC-DC Converter Block 5.0VOUT FeedBack GND R1 R2 R3 R4 VFB GND PWR_EN1 BOOST# 1 2 3 4 5 15 14 13 12 PWR_EN2 GND VBUS1 COMM_ILIM 11 GND FLAG UCS2113 20-QFN 4 x 4 mm VBUS1 VBUS2 VBUS2 5VOUT R1 R2 R3 ++ V FB R3 -------------------------------------------------------- = VOUT R2 R3 + R 1 VFB R3 R4 -------------------------------------------------------- = VOUT 5VOUT VFB -------------------- R1 R3 ------ – R1 VFB R4 ------------------------ = If R1 R3 VOUT 5VOUT R1 R4 --------------------------------- |
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