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DS3205 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS3205 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page ____________________________________________________________________________________________ DS3205 Rev: 111607 9 of 20 3. Pin Descriptions Table 3-1. Pin Descriptions NAME PIN TYPE FUNCTION ENABLE 1 I Enable Input. This input pin establishes the board-to-backplane connection when driven to a level above VDD/2 (approximately) with 50mV hysteresis. 0 = Disable connection and enter low-power mode. 1 = Enable connection of backplane and board buses. SCLOUT 2 I/O Serial Clock Output. This pin is connected to the board’s SCL signal. SDAOUT 3 I/O Serial Data Output. This pin is connected to the board’s SDA signal. ACIE 4 I Accelerator Current on Inputs Enable. This input pin enables/disables the rise- time accelerators on the bus input pins. 0 = Disable rise-time accelerator on SCLIN and SDAIN. 1 = Enable rise-time accelerator on SCLIN and SDAIN. ACOE 5 I Accelerator Current on Outputs Enable. This input pin enables/disables the rise- time accelerators on the bus output pins. 0 = Disable rise-time accelerator on SCLOUT and SDAOUT. 1 = Enable rise-time accelerator on SCLOUT and SDAOUT. ASR 6 I Accelerator Slew Rate Threshold Select. This input pin selects the rate for the rise-time accelerators. 0 = 0.8V/ μs 1 = 1.25V/ μs VSS 7 P Ground READY 8 Ood Connected Status Indicator. This is an open-drain output that goes high when the device is in the ACTIVE state. See the state diagram in Figure 2-3. This pin should have an external 10k Ω pullup resistor. 0 = Backplane and board buses not connected. 1 (float) = Backplane and board buses connected. FAULT 9 Ood Active-Low Bus Fault Indicator. This open-drain output pin indicates a “stuck bus” condition when = 0. This pin should have an external 10k Ω pullup resistor. 0 = Either SCLOUT or SDAOUT has been low > 30ms. 1 = No stuck bus fault. SBCLK 10 I Stuck Bus Clocking Enable. Asserting this pin high causes the DS3205 to drive clock pulses onto the SCLOUT pin in an attempt to free a stuck bus when a “stuck bus” condition has been detected. See Section 4 and Figure 2-3 for more information on the stuck bus condition. 0 = Disable automatic clocking during stuck bus fault. 1 = Enable automatic clocking during stuck bus fault. Note: Asserting both SBDIS and SBCLK high at the same time is not valid and can produce unwanted results. SBDIS 11 I Stuck Bus Disconnect Enable. Asserting this pin high causes the DS3205 to disconnect the backplane signals from the board signals when a “stuck bus” condition has been detected. See Section 4 and Figure 2-3 for more information on the stuck bus condition. 0 = Disable automatic disconnect on stuck bus fault. 1 = Enable automatic disconnect on stuck bus fault. Note: Asserting both SBDIS and SBCLK high at the same time is not valid and can produce unwanted results. |
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