adm1014 Analog Devices, Inc., adm1014 Datasheet - Page 5

• Manufacturer Part Number: adm1014
• Description: Dual Pci Hot-plugtm Controller
• Manufacturer: Analog Devices, Inc.

REV. PrN 1/02
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Mnemonic
M12VOA
M12VGA
PWRONA
FLTNA
FAUXA
OCSET
AUXGA
AUXOA
12VGA
12VOA
12VOB
12VGB
AUXOB
AUXGB
FAUXB
FLTNB
PWRONB
M12VGB
M12VOB
Function
Switched -12V output for channel A. Rated for 100mA.
Gate of channel A internal NMOS transistor. A capacitor connected from this pin to -12VOA (pin 1)
sets the start-up ramp for the +12V supply. During turn-on, this capacitor is charged from a 25µA
current source.
Power on control for channel A. 3.3V CMOS-compatible logic input controls all four main supplies.
PWRONA high = outputs on, PWRONA low = outputs off.
Active-low, 5V compatible, Open Drain fault output for channel A. A pull-up resistor connects the
pin to 3.3VAux. 4.7k is recommended for this function. An optional capacitor may be connected
from this pin to GND to provide improved immunity to power supply transients.
Active-low, 3.3V compatible, Open Drain fault output for Aux channel A. The same pull-up resistor
as that on FLTNA connects the pin to 3.3VAux.
Overcurrent set for all 10 outputs. A resistor connected from this pin to ground sets the overcurrent
trip point of all eight supplies. All eight overcurrent trip-points can be programmed by changing the
value of this resistor. The default value of 6.04k , ±1% is compatible with the maximum currents
allowed by the PCI specification.
Gate of channel A +3.3VAUX internal PMOS transistor. A capacitor connected from this pin to
AUXOA (pin 8) sets the start-up ramp for the +3.3VAUX supply. During turn-on, this capacitor is
charged from a 25µA current source.
Switched 3.3V auxiliary output for channel A. Rated for 0.375A.
Gate of channel A internal PMOS transistor. A capacitor connected from this pin to 12VOA (pin 10)
sets the start-up ramp for the +12V supply. During turn-on, this capacitor is charged from a 25µA
current source. The undervoltage circuitry is disabled when the voltage on 12VGA rises above 1.2V.
If the capacitor on pin 7 (AUXGA) or pin 33 (3V5VGA) is more than 25% larger than the capacitor on
pin 9 (12VGA) a false undervoltage condition may be detected during startup.
Switched 12V output for channel A. Rated for 0.5A.
Switched 12V output for channel B. Rated for 0.5A.
Gate of channel B internal PMOS transistor. A capacitor connected from this pin to 12VOB (pin 11)
sets the start-up ramp for the +12V supply. During turn-on, this capacitor is charged from a 25µA
current source. The undervoltage circuitry is disabled when the voltage on 12VGB rises above 1.2V.
If the capacitor on the pin 25 (3V5VGB) or pin 14 (AUXGB) is more than 25% larger than the
capacitor on pin 12 (12VGB) a false undervoltage condition may be detected during startup.
Switched 3.3V auxiliary output for channel B. Rated for 0.375A.
Gate of channel B +3.3VAUX internal PMOS transistor. A capacitor connected from this pin to
AUXOB (pin 13) sets the start-up ramp for the +3.3VAUX supply. During turn-on, this capacitor is
charged from a 25µA current source.
Active-low, 3.3V compatible, Open Drain fault output for Aux channel B. The same pull-up resistor
as that on FLTNA connects the pin to 3.3VAux.
Active-low, 5V compatible, Open Drain fault output for channel B. A pull-up resistor connects the
pin to 3.3VAux. 4.7k is recommended for this function. An optional capacitor may be connected
from this pin to GND to provide improved immunity to power supply transients.
Power on control for channel B. 3.3V CMOS-compatible logic input controls all four main supplies.
PWRONB high = outputs on, PWRONB low = outputs off.
Gate of channel B internal NMOS transistor. A capacitor connected from this pin to -12VOB (pin 19)
sets the start-up ramp for the +12V supply. During turn-on, this capacitor is charged from a 25µA
current source.
Switched -12V output for channel B. Rated for 100mA.
PIN FUNCTION DESCRIPTION
–5–
ADM1014