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MC141556 bảng dữ liệu(PDF) 6 Page - Freescale Semiconductor, Inc |
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MC141556 bảng dữ liệu(HTML) 6 Page - Freescale Semiconductor, Inc |
6 / 18 page MC141556 6 MOTOROLA PIN DESCRIPTION VDD (Pin 1) This is the +5V power pin of the chip. OSC1 (Pin 2), OSC2 (Pin 3) The OSC1 and OSC2 pins are the connections for the on- chip oscillator. The crystal frequency is 24MHz . OSC1 may be driven by an external oscillator if an external crystal circuit is not used. VSS (Pin 4) This is the ground pin of the chip. IICEN (Pin 5) This is an input pin which requires the default input state to determine the IIC Mode of Hub controller. During Power- On Reset, pulling IICEN high configures MC141556 as a IIC slave to allow customized parameters programmable. Pull- ing this pin low disables IIC Mode and adopts default param- eters. See Table1 Configuration selection for detail. DP0 (Pin 6) This is the upstream differential data plus I/O pin of the Hub. DM0 (Pin 7) This is the upstream differential data minus I/O pin of the Hub. VDD3CAP (Pin 8) This pin must connect an external capacitor for the inter- nal 3.3V regulator which supply transceivers of all USB ports. OVR1 (Pin 9) This is the over-current detection pin of the downstream port 1. Active low is to indicate overcurrent condition occurs. In GANG mode, OVR1 is the common detection pin for all the four downstream ports. PWRSW1 (Pin 10) This is an output pin which can be used to switch on/off the external power regulator for the downstream port 1. Active high is to switch on the power. In GANG mode, PWRSW1 is the common output pin for all the four down- stream ports. DP1 (Pin 11) This is the differential data plus I/O pin of the downstream port 1. DM1 (Pin 12) This is the differential data minus I/O pin of the down- stream port 1. OVR2 (Pin 13) This is the over-current detection pin of the downstream port 2. Active low is to indicate overcurrent condition occurs. PWRSW2 (Pin 14) This is an output pin which can be used to switch on/off the external power regulator for the downstream port 2. Active high is to switch on the power. DP2 (Pin 15) This is the differential data plus I/O pin of the downstream port 2. DM2 (Pin 16) This is the differential data minus I/O pin of the down- stream port 2. OVR3 (Pin 17) This is the over-current detection pin of the downstream port 3. Active low is to indicate overcurrent condition occurs. PWRSW3 (Pin 18) This is an output pin which can be used to switch on/off the external power regulator for the downstream port 3. Active high is to switch on the power. DP3 (Pin 19) This is the differential data plus I/O pin of the down- stream port 3. DM3 (Pin 20) This is the differential data minus I/O pin of the down- stream port 3. OVR4 (Pin 21) This is the over-current detection pin of the downstream port 4. Active low is to indicate overcurrent condition oc- curs. PWRSW4 (Pin 22) This is an output pin which can be used to switch on/off the external power regulator for the downstream port 4. Active high is to switch on the power. DP4 (Pin 23) This is the differential data plus I/O pin of the downstream port 4. DM4 (Pin 24) This is the differential data minus I/O pin of the down- stream port 4. OVR5/GANG/SCL (Pin 25) When IIC Mode: this input pin acts as SCL, which is the synchronizing clock input from the transmitter for IIC proto- col. (Detailed description of the programming protocol will be discussed in the IIC Communication section). When non-IIC Mode: if self-powered, this input pin acts as OVR5, which is overcurrent detection of downstream port 5; active low is to indicate overcurrent occurs. If bus-powered, this input pin acts as GANG to determine Power Control Mode; pulling this pin low configures the Hub as Ganged control, and pulling it high as Individual control. PWRSW5/SDA (Pin 26) When IIC Mode: this pin acts as SDA, which is a uni- directional data line for IIC protocol. (Detailed description of the programming protocol will be discussed in the IIC Com- munication section). When non-IIC Mode: if self-powered, this output pin is to switch on/off the external power regulator for downstream port 5; active high is to switch on the power. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Số phần tương tự - MC141556 |
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Mô tả tương tự - MC141556 |
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