Industrial Temperature Rated USB 2.0
Datasheet
Chapter 3 Pin Descriptions
3.1PIN Descriptions
This section provides a detailed description of each signal. The signals are arranged in functional groups according to their associated interface.
The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal is at a low voltage level. When “N” is not present before the signal name, the signal is asserted when at the high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a signal is active, independent of whether that level is represented by a high or low voltage. The term negate, or negation, indicates that a signal is inactive.
Table 3.1 USB2514 Pin Descriptions
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| SYMBOL | 36 QFN | 48 QFN | TYPE | DESCRIPTION |
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| UPSTREAM USB INTERFACES | ||
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USBUP_DP | 31 | 43 | USB Bus Data | |
USBUP_DM | 30 | 42 |
| These pins connect to the upstream USB bus data |
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| signals (Host port, or upstream hub). |
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VBUS_DET | 27 | 35 | I/O12 | Detect Upstream VBUS Power |
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| Detects state of Upstream VBUS power. The SMSC Hub |
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| monitors VBUS_DET to determine when to assert the |
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| internal D+ |
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| When designing a detachable hub, this pin must be |
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| connected to the VBUS power pin of the USB port that |
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| is upstream of the hub. |
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| For |
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| attached host, this pin must be connected to 3.3V |
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| (typically VDD33). |
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| DOWNSTREAM | ||
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USBDN_DP[3:1]/ | 7 | 7 | ||
PRT_DIS_P[3:1] | 4 | 4 |
| These pins connect to the downstream USB peripheral |
| 2 | 2 |
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& |
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| devices attached to the hub’s port. |
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USBDN_DM[3:1]/ | 6 | 6 |
| Downstream Port Disable Strap option: |
3 | 3 |
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PRT_DIS_M[3:1] |
| If this strap is enabled by package and configuration | ||
1 | 1 |
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| settings (see Table 3.2), this pin will be sampled at |
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| RESET_N negation to determine if the port is disabled. |
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| Both USB data pins for the corresponding port must be |
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| tied to the VDDA33 to disable the associated |
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| downstream port. |
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PRTPWR[3:1] | 18 | 21 | O12 | USB Power Enable |
| 16 | 19 |
| Enables power to USB peripheral devices downstream. |
| 12 | 15 |
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| The active signal level of the PRTPWR[3:1] pins is |
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| determined by the Power Polarity Strapping function of |
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| the PRTPWR_POL pin. |
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SMSC USB2513i | 9 | Revision 1.98 |
| DATASHEET |
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