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Freescale Semiconductor, Inc . 6501 William Cannon Drive West MD: OE58, Austin, TX 78735 www.freescale.com
3. Power supply
To secure fail-safe interconnection between PQ-MDS-PIB and PCI Add-in card/cards
inserted into the PQ-MDS-PCIEXP slots PCI interface buffers placed on PQ-MDS-PIB
board should be 3-stated until signal Power-OK from ATX PS (OK) received. In its turn
this signal produced by ATX PS after ATX PS_ON- signal from PQ-MDS-PIB board
(OK) received, and all voltages supplied by PS are stable. To summarize this explanation
power sequence timing-diagram represented in the Figure 2.
Figure 2
4
1
2
3
PQ-MDS-PIB
Buffer
Enable/Disable
ATXPS_ON-
Signal
ATX PS Voltages
3V3, 5V, 12V, -12V
ATX PS
Power OK
Signal
Time
≤ 1000mS
≥ 1mS
To simplify integration procedure there is the service jumper populated in the PQ-MDS-
PCIEXP , which provide manual ATX PS_ON signal to the PS or remote one from
PQ-MDS-PIB board as it’s explained above (short J1 pins 1-2 or 2-3 correspondingly).
Usage of external ATX PS to supply inserted PCI cards provide capability to use up to 6
add-in cards without any power consumption restriction.
Two LED’s are populated on the board to indicate:
-
-
ATX-PS connection (PS-RDY) and
Normal operation (PWR-ON)
J1 default – short 1-2 pins (Manual ATX PS Control)
4
PCI Expansion Adapter Board 084-00195-1UM
Rev1.1
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相关PDF资料
PQF-44
PLUG QFP 44PIN (SOLDER DOWN)
PRG18BB471MS1RB
THERMISTOR
PS1600
POWER SUPPLY HOTSWAP 90-245V
PS5100EV
KIT EVALUATION PS5100 W/PS051
PS5162EV
KIT EVALUATION PS5162 W/PS051
PS5163
MODULE BATTERY MGR W/LED DISPLAY
PS5164EV
KIT EVALUATION PS5164 W/PS051
PS7070EV
BOARD EVAL PS700 W/POWERINFO2
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