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參數(shù)資料
| 型號(hào)： | HEF4754VF |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 18-element bar graph LCD driver |
| 中文描述： | 18元條形圖LCD驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 68K |
| 代理商： | HEF4754VF |
January 1995
4
Philips Semiconductors
Product specification
18-element bar graph LCD driver
HEF4754V
LSI
GENERAL DESCRIPTION
The HEF4754V drives an 18-element bar graph LCD in
linear relation to the control voltage (V
c
) in a pointer or
thermometer mode. The first bar lights up when V
c
is
smaller than V
T(bar)2
(see equation [3] below).
In the pointer mode, the circuit can drive 9 or 18 bars; in
the thermometer mode, the circuit also drives the peak
value indication. This can be reset or repetitively reset,
after 1,5 to 2 seconds.
The circuit has analogue and digital parts. The analogue
part consists of 17 comparators, with their non-inverting
inputs connected together and coupled to the control input
V
c
. The inverting inputs of the comparators are connected
in succession to the nodes of an 18-part resistor divider.
The distance between the switching levels of the
comparators is defined by the voltage difference across
this divider. The extremities of the resistor divider are
coupled via high-input amplifiers to the maximum
reference voltage input and the minimum reference
voltage input.
The digital part has one reference output (O
R
) to drive the
back plate, and 18 outputs (O
1
to O
18
) to drive each bar.
Three latches and some gates are incorporated for each
bar output. An on-chip oscillator (1024 Hz) with external R
and C drives the circuit. The outputs are driven at 64 Hz.
The select inputs I
1
to I
3
are provided with an on-chip
pull-up element, and they may therefore be left floating
(equals HIGH state).
LINEARITY
V
DD
= 10 V; V
ref max
= 9,5 V; V
ref min
= 0,5 V; T
amb
= 25
°
C
V
1
= 250 mV (this is the tolerance of the step voltage).
V
step
’ is the (internal) voltage drop across the resistor-ladder
network.
V
2
is the maximum offset voltage spread of the on-chip
voltage follower.
V
2
= 250 mV.
The linearity is guaranteed for V
DD
>
10 V.
The monotony between V
DD
= 5 V and 10 V is guaranteed.
During ramping-up of the input voltage a maximum of two
bars might be activated simultaneously.
ABSOLUTE VOLTAGE TRIGGER LEVEL
The absolute voltage trigger level at the V
c
pin is V
T(bar)n;
±
{
=
n = number of bars; 2
≤
n
≤
18.
For n = 1 (first bar) see text above.
Note
* For
V
2
the same sign (+ or
) should be used as in equation [2].
V
step
V
step""
V
1
[1]
+
=
V
step
′
V
---------------------------------------------------------------------------------------
V
±
(
)
V
V
±
(
)
–
18
[2]
=
V
T bar
)
n
V
ref min
V
2
*
}
n
1
–
(
)
V
step
′
V
1
±
{
}
in which
,
[3]
+
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