Philips PM2517E - Page 55

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49
1
3.4-4.2.
6
7
8
Specifications
of inputs and
outputs
Description
Digit Select
Digit Select
lr
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10
IJ
Vss(-8,5V)
CLOCK
Latch Enable
(Not
used
in
PlVl
251 7
E
)
Automatic
Ranging
Range Extention
Range
C
Range B
Range A
l\4anual rangang
Up or down
Test input
Supply
Clock input
One
of
the outputs
(DS2)
is used for the
phase
clock of
the Liquid
Cristal
Display,
for the clock'input
of the
OO 0055
and
for the
phase
inputs of
the LX
drivers
HEF 4543.
Pulse for Iatching the BCD
information
for a
LX
display.
The LAEN
pulse
is fed to a
1
of
4
decoder
to disable the decoder
while DS1 and
DS2
are
changing.
Logic
1 is automatic
ranging.
The range
information
wi!l be changed
when the
measuring
result
is
(
900 and
) 9999.
<
900
=
down ranging
)
9999
=
up ranging
Logic 0
no
automatic
ranging
(manual
ranging)
Range switching can
be effected
by the manual
range
switches.
With this signal the
ranges can
be
extended.
This signal is used
in the
function Q and
is activated
by the
function switch.
Logic 0
=
the
range
switch
span consists
of
4 ranges.
Logic 1
=
the range span
consists
of 6
ranges.
Range information
no action
down rangrng
up ranging
not specified
0
0
I
,|
0
1
0
I
Test
pin
for lC testing
during manufacturing.
The testpin
is connected to
Vss
-8.5
V.
Negativ€ supply voltage
(-8.5
V)
Incoming clock
frequency
from OO 0060
(80
kHz
... 120
kHz)
Digit Select Outputs
IVlSD
lvl
ost
Signi{icant
Digit
Manual range iniormation