MAX5960AECS+T【PDF 13/25 页】IC CTRLR HOT-PLUG QD 80-TQFP

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Sheet目录43

9页 10页 11页 12页 [13页]14页 15页 16页 17页

Quad PCI Express, Hot-Plug Controllers

______________________________________________________________________________________ 13

Pin Description (continued)

NAME

FUNCTION

12SD+

Slot D 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to

12SD+ using the Kelvin-sensing technique to ensure accurate current sensing.

3.3GD

Slot D 3.3V Gate-Drive Output. Connect 3.3GD to the gate of slot Ds 3.3V MOSFET. At power-up,

3.3GD

is charged to 5.5V above the 3.3V supply by a constant current derived from V

12VIN

. V

3.3GD

rise time is determined by the external gate capacitance.

3.3SD-

Slot D 3.3V Negative Current-Sense Input. Connect to the negative side of the sense resistor using the

Kelvin-sensing technique to ensure accurate current sensing.

3.3SD+

Slot D 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to

3.3SD+ using the Kelvin-sensing technique to ensure accurate current sensing.

PRES-DETB

Slot B Present-Detect Input. PRES-DETB accepts inputs from PRSNT#_# on a PCIe connector.

PRES-DETB has an internal 50k?pullup to 3.3VAUXIN. When PRES-DETB is low, the outputs follow the

command from ONB and AUXONB after a 4ms debounced time. When PRES-DETB goes from low to

high, all outputs of the respective slot shut down with no delay.

FONB

Slot B Forced-On Input. FONB has a 50k?internal pullup to 3.3VAUXIN. A logic-low on FONB turns on

all slot B outputs as long as the power inputs are within their operating range, regardless of the status of

the other input signals. Leave FONB unconnected for normal operation.

PRES-DETA

Slot A Present-Detect Input. PRES-DETA accepts inputs from PRSNT#_# on a PCIe connector.

PRES-DETA has an internal 50k?pullup to 3.3VAUXIN. When PRES-DETA is low, the outputs follow the

command from ONA and AUXONA after a 4ms debounced time. When PRES-DETA goes from low to

high, all outputs of the respective slot shut down with no delay.

FONA

Slot A Forced-On Input. FONA has a 50k?internal pullup to 3.3VAUXIN. A logic-low on FONA turns on

all slot A outputs as long as the power inputs are within their operating range, regardless of the status of

the other input signals. Leave FONA unconnected for normal operation.

OUTPUT4 Digital Output 4. 4ms debounced digital output of INPUT4.

INPUT4

Digital Logic Gate Input 4

OUTPUT3 Digital Output 3. 4ms debounced digital output of INPUT3.

INPUT3

Digital Logic Gate Input 3

ONA

Slot A 12V and 3.3V Outputs Enable. A logic-high at ONA turns on the 12V and 3.3V outputs of slot A

(see Table 2).

AUXONA

Slot A 3.3V Auxiliary Output Enable. A logic-high at AUXONA turns on the slot A auxiliary output.

12SA+

Slot A 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to

12SA+ using the Kelvin-sensing technique to ensure accurate current sensing.

12SA-

Slot A 12V Negative Current-Sense Input. Connect 12SA- to the negative side of the current-sense

resistor using the Kelvin-sensing technique to ensure accurate current sensing.

12GA

Slot A 12V Gate-Drive Output. Connect 12GA to the gate of slot As 12V MOSFET. At power-up, V

12GA

is raised to the internal charge-pump voltage level by a constant current.

3.3SA+

Slot A 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to

3.3SA+ using the Kelvin-sensing technique to ensure accurate current sensing.

3.3SA-

Slot A 3.3V Negative Current-Sense Input. Connect to the negative side of the sense resistor using the

Kelvin-sensing technique to ensure accurate current sensing.

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