CubeSat Kit PPM B1 Rev. A
© Pumpkin, Inc. 2003-2009
10
of
14
August 2009 – document Rev. B
-ON_MHX
H1.84 O
Control signal for MHX socket power. From P4.2 (U1.96).
Active LOW, pulled high on the MB. When active, enables
PWR_MHX on the MB, thereby powering MHX socket and
MHX level translators / isolators. Normally configured as a
digital output.
-OE_MHX
H1.86 O
Control signal for MHX interface. From P4.3 (U1.95). Active
LOW, pulled high on the MB. When active, enables signals to
pass through MHX level translators / isolators. Normally
configured as a digital output.
-OE_USB
O
Control signal for USB interface. From P4.4 (U1.94). Active
LOW, pulled high on the MB. When active, enables signals to
pass through USB level translators / isolators. Normally
configured as a digital output.
-INT
H1.88
I
Output from RTC’s -IRQ open-collector output. To P4.4
(U1.94). Can be used to poll MB RTC's interrupt output.
Normally configured as a digital input.
HS0
H1.90 I
Handshake signal. -RTS (USB) or -CTS (MHX). To P5.0
(U1.88). Can be configured as an external interrupt to U1 or
input handshake signal via its Peripheral Pin Select. Requires
that R10 be fitted on the MB.
HS1
H1.92 I
Handshake signal. -DTR (USB) or -DSR (MHX). To P5.1
(U1.87). Can be configured as an external interrupt to U1 or
input handshake signal via its Peripheral Pin Select. Requires
that R11 be fitted on the MB.
HS2
H1.94 I
Handshake signal. -PWE (USB) or -DCD (MHX). To P5.2
(U1.86). Can be configured as an external interrupt to U1 or
input handshake signal via its Peripheral Pin Select. Requires
that R12 be fitted on the MB.
HS3
H1.96 O
Handshake signal. -CTS (USB) or -RTS (MHX). From P5.3
(U1.85). Can be configured as an output handshake signal
via its Peripheral Pin Select. Requires that R75 be fitted on
the MB.
HS4
H1.98 O
Handshake signal. -RI (USB) or -DTR (MHX). From P5.4
(U1.84). Can be configured as an output handshake signal
via its Peripheral Pin Select. Requires that R76 be fitted on
the MB.
HS5
H1.100 O
Handshake (reset) signal. -RST (USB) or -RST (MHX). From
P5.5 (U1.83). Can be configured as an output
handshake
signal via its Peripheral Pin Select. Requires that R77 be
fitted on the MB.
PPM PIN DESCRIPTIONS – Control & Status
Name Pin I/O CSKB Description
-FAULT_OC
H1.65 O
Open-collector output from PPM’s latchup prevention
overcurrent switch. Active LOW. Wire-ORed to -FAULT_OC
on the MB.
SENSE
H1.67 –
•
Can be used to measure PPM's current consumption. The
current used by the PPM from a single source is (source –
SENSE) / 75mΩ. Depends on PPM implementation.
-RESET
H1.69 I
•
Reset signal to PPM's reset supervisor. Active LOW.
OFF_VCC
H1.71 I
•
Control signal to PPM’s power circuit(s). Active HIGH.
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