MAX5959/MAX5960
Quad PCI Express, Hot-Plug Controllers
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Pin Description
PIN NAME FUNCTION
1 12SB-
Slot B 12V Negative Current-Sense Input. Connect 12SB- to the negative side of the current-sense
resistor using the Kelvin-sensing technique to ensure accurate current sensing.
2 12SB+
Slot B 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to
12SB+ using the Kelvin-sensing technique to ensure accurate current sensing.
3 AUXONB Slot B 3.3V Auxiliary Output Enable. A logic-high at AUXONB turns on the slot B auxiliary output.
4 ONB
Slot B 12V and 3.3V Main Outputs Enable. A logic-high at ONB turns on the 12V and 3.3V main outputs
of slot B (see Table 2).
5 INPUT1 Digital Logic Gate Input 1
6 OUTPUT1 Digital Output 1. 4ms debounced digital output of INPUT1.
7 INPUT2 Digital Logic Gate Input 2
8 OUTPUT2 Digital Output 2. 4ms debounced digital output of INPUT2.
9, 61, 80 N.C. No Connection. Not internally connected. Leave unconnected.
10 FOND
Slot D Forced-On Input. FOND has a 50kΩ internal pullup to 3.3VAUXIN. A logic-low on FOND turns on
all slot D outputs as long as the power inputs are within their operating range, regardless of the status
of the other input signals. Leave FOND unconnected for normal operation.
11 PRES-DETD
Slot D Present-Detect Input. PRES-DETD accepts inputs from PRSNT#_# on a PCIe connector. PRES-
DETD has an internal 50kΩ pullup to 3.3VAUXIN. When PRES-DETA is low, the outputs follow the
command from OND and AUXOND after a 4ms debounced time. When PRES-DETD goes from low to
high, all outputs of the respective slot shut down with no delay.
12 OND
Slot D 12V and 3.3V Main Outputs Enable. A logic-high at OND turns on the 12V and 3.3V main outputs
of slot D (see Table 2).
13 AUXOND Slot D 3.3V Auxiliary Output Enable. A logic-high at AUXOND turns on the slot D auxiliary output.
14 GND Ground
15 FONC
Slot C Forced-On Input C. FONC has a 50kΩ internal pullup to 3.3VAUXIN. A logic-low on FONC turns
on all slot C outputs as long as the power inputs are within their operating range, regardless of the
status of the other input signals. Leave FONC unconnected for normal operation.
16 PRES-DETC
Slot C Present-Detect Input. PRES-DETC accepts inputs from PRSNT#_# on a PCIe connector. PRES-
DETC has an internal 50kΩ pullup to 3.3VAUXIN. When PRES-DETC is low, the outputs follow the
command from ONC and AUXONC after a 4ms debounced time. When PRES-DETC goes from low to
high, all outputs of the respective slot shut down with no delay.
17 ONC
Slot C 12V And 3.3V Main Outputs Enable. A logic-high at ONC turns on the 12V and 3.3V main outputs
of slot C (see Table 2).
18 AUXONC Slot C 3.3V Auxiliary Output Enable. A logic-high at AUXONC turns on the slot C auxiliary output.
19 12SC+
Slot C 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to
12SC+ using the Kelvin-sensing technique to ensure accurate current sensing.
20 12SC-
Slot C 12V Negative Current-Sense Input. Connect 12SC- to the negative side of the current-sense
resistor using the Kelvin-sensing technique to ensure accurate current sensing.
21 12GC
Slot C 12V Gate-Drive Output. Connect 12GC to the gate of slot C’s 12V MOSFET. At power-up, 12GC
is raised to the internal charge-pump voltage level by a constant current.
22 3.3SC+
Slot C 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to
3.3SC+ using the Kelvin-sensing technique to ensure accurate current sensing.
(34 Seiten)
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