DS3205 Просмотр технического описания (PDF) - Maxim Integrated

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DS3205

Hot-Swappable Bus Buffer for I2C, SMBus, IPMI, and ATCA

Maxim Integrated 

____________________________________________________________________________________________ DS3205

3. Pin Descriptions

Table 3-1. Pin Descriptions

NAME PIN TYPE

FUNCTION

ENABLE 1

Enable Input. This input pin establishes the board-to-backplane connection when

I

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.

Accelerator Current on Inputs Enable. This input pin enables/disables the rise-

ACIE

4

I

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

Accelerator Current on Outputs Enable. This input pin enables/disables the rise-

I

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.

Accelerator Slew Rate Threshold Select. This input pin selects the rate for the

ASR

6

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rise-time accelerators.

0 = 0.8V/μs

1 = 1.25V/μs

VSS

7

P Ground

READY

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

8 Ood have an external 10kΩ pullup resistor.

0 = Backplane and board buses not connected.

1 (float) = Backplane and board buses connected.

FAULT

Active-Low Bus Fault Indicator. This open-drain output pin indicates a “stuck bus”

9

Ood

condition when = 0. This pin should have an external 10kΩ pullup resistor.

0 = Either SCLOUT or SDAOUT has been low > 30ms.

1 = No stuck bus fault.

SBCLK 10

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

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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

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

I 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.

Rev: 111607

9 of 20

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