The HI-8045 high voltage display driver is a low cost
plastic, 80-segment version of the Holt HI-8040 display
driver series. The 20 mil package lead pitch allows the
maximum number of display driver segments in the
smallest space.
An optional voltage converter can
generate the negative display drive voltage. Test inputs
facilitate opens and shorts testing. The backplane fre-
quency is checked and, as long as power is available, the
segments are shut "Off" if the frequency becomes too low.
The HI-8045 and the HI-80XX series of display drivers all
control segment information in the same way. Data is
serially clocked into the device and the data for all segment
outputs are latched in parallel when the Load input transi-
tions from high to low. With the Data Out from the shift
register available, devices may be cascaded to obtain more
segment outputs. The shift register is 85 bits long.
The die is metal mask programmable to provide for various
package and/or cascade tap options. Consult your Holt
Sales representative to explore the possibilities.
PIN CONFIGURATION
(Top View)
S80
S79
S78
S77
S76
S75
S74
S73
S72
S71
S70
S69
S68
S67
S66
S65
S64
S63
S62
S61
S60
S59
S58
S57
S56
N/C
V
SS
CS
CL
LD
DIN
BPOSC
N/C
N/C
BPIN
N/C
CONVOUT
V
DD
DOUT 85
CONVOSC
V
EE
T1
T2
BP
S1
S2
S3
S4
S5
S6
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
FEATURES
!
4 MHz serial input data rate
!
80 segment outputs
!
Cascadable
!
5 Volt inputs translated to 35 Volts
!
Test pins allow hardware all "ON", all "OFF" or
alternating
!
Monitors backplane oscillation and forces all
segments to "OFF" condition if below 10Hz
!
Negative voltage converter available on-chip
!
CMOS low power
!
Industrial and JEDEC processing available
FUNCTIONAL BLOCK DIAGRAM
DIN
CL
CS
LD
BPOSC
BPIN
Þ
Þ
Þ
Þ
Þ
Þ
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
N/C
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
HI-8045PQ
80 - SEGMENT
100 - PIN
PLASTIC
QUAD FLAT PACK
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
S55
S54
S53
S52
S51
S50
S49
S48
S47
S46
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33
S32
S31
DATA IN
85 Stage
Shift Register
CLK
Þ
DOUT
85
LE
80 Bit Latch
Oscillator
Divider
Vo l t a g e
Tr a n s l a t o r
H i g h Vo l t a g e
B u ff e r
Vo l t a g e
Tr a n s l a t o r s
H i g h Vo l t a g e
Drivers
Þ
BP
(DS8045, Rev. E)
80 SEGMENTS
HOLT INTEGRATED CIRCUITS
www.holtic.com
03/07
HI-8045
FUNCTIONAL DESCRIPTION
INPUT LOGIC
CS must be held low to enter data into the shift register.
The data is clocked on the negative edge of CL. LD is nor-
mally held low and only pulsed high when new data is
ready for display. When LD is high the latch is transparent.
All four logic inputs are TTL compatible. A logic "1" at DIN
that is eventually latched to the segment drivers will cause
the segment to be at the opposite voltage level of the BP
pin (out of phase).
BPOSC and BPIN
The user can either make an oscillator to create the
backplane frequency or drive an external clock into BPIN
leaving BPOSC open. To make an oscillator, pins BPOSC
and BPIN must be connected together and the appropriate
R and C combination applied (See Figure 1). If the oscilla-
tor is used, the backplane frequency is approximately
1
f
BP
=
(for R = 180K
W &
C = 220pF, f
BP
»
100Hz).
256 RC
VEE & NEGATIVE VOLTAGE CONVERTER
VEE may be externally driven to a maximum -30V. Alterna-
tively, there is a voltage converter that will provide
-21.4 volts (See Figure 2). If the converter pins are left
open circuit, an on-chip sense resistor will cause shut
down of all current consumption associated with the con-
verter. The converter will survive a shorted segment condi-
tion and continue to maintain VEE at -20 volts.
DOUT
The DOUT pin is available from segment 85 for cascading
devices to drive more segments and for verifying the data
integrity. However only the first 80 output segments are
available to the user. This output can drive 2 TTL loads. It
changes on the positive edge of CL.
AUTOMATIC SEGMENTS OFF
The internal backplane signal is tested continuously to be at
least 10Hz. If the detector senses f<10Hz, then the segments
are forced to the same voltage as the backplane (all seg-
ments in "OFF" state). However, the detector is only func-
tional while VDD is above the minimum operating voltage
specification.
TEST INPUTS
The test functions available are:
T2
0
0
1
1
T1
0
1
0
1
Display
Normal
All Off
All On
Alternating On/Off Segments
The test inputs must be tied to the appropriate logic level for
correct circuit operation.
V
DD
R 330KW
C
R
CONVOSC
OSC
R
SENSE
Control
÷ 256
V
DD
R
Q
IN5818, IN5819
BPIN
C
V
SS
CONVOUT
330µH
V
SS
TO BACKPLANE
TRANSLATOR
AND DRIVER
V
DD
BPOSC
VEE
10µF
V
SS
Figure 1. INTERNAL OSCILLATOR CIRCUIT
Figure 2. OPTIONAL VOLTAGE CONVERTER
HOLT INTEGRATED CIRCUITS
2
HI-8045
LD
CL
CS
DIN
BP
CS CL LD
DIN
DO
CS CL LD
DIN
DO
CS CL LD
DIN
DO
1MW
1500pF
1µF
1MW
1µF
R
BPIN
BP
BPIN
BPOSC
BP
BPIN
BPOSC
BP
V
os
C
BPOSC
1MW
SEGMENTS
SEGMENTS
BACK
PLANE
SEGMENTS
1MW
1µF
SEG
n
360pF
1µF
Figure 3. RC OSCILLATOR AND CASCADED
DEVICES
Figure 4. OFFSET MEASUREMENT
CL
INPUT
t
CL
t
CW
DIN
INPUT
t
DS
t
DH
CS
INPUT
t
CSS
t
CSH
LD
INPUT
t
LCS
t
CSL
t
LS
VALID
t
CDO
DOUT
OUTPUT
t
LW
Figure 5. TIMING DIAGRAM
HOLT INTEGRATED CIRCUITS
3
HI-8045
ABSOLUTE MAXIMUM RATINGS
Voltages referenced to VSS = 0V
VDD........................ 0V to 7V
VEE................VDD-35V to 0V
Voltage at any input, except BPIN....-0.3 to VDD+0.3V
Voltage at BPIN input.................VDD-35 to VDD+0.3V
DC Current any input pin...................................10 mA
Supply Voltage
Power Dissipation......................................................300 mW
Operating Temperature Range - Industrial.......-40° to +85°C
Operating Temperature Range - Hi-Temp........-55° to +125°C
Storage Temperature Range............................-65° to +150°C
NOTE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only.
Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
VDD = 5V ±5%, VEE = -21.5V, VSS = 0V, TA = Operating temperature range (unless otherwise specified).
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
Operating Voltage
Supply Current:
Input Low Voltage
Input High Voltage
Input Low Voltage
Input High Voltage
Input Current
Input Capacitance
(Converter Off, fBP = 100Hz)
(excluding BPIN)
(excluding BPIN)
(BPIN)
(BPIN)
(Guaranteed, not tested)
Segment Output Impedance
Backplane Output Impedance
Data Out Current:
Source Current
Sink Current
Voltage Converter:
@ No Load
(VDD - VSS = 5V, TA = 25°C)
@ 0.1mA Load
@ 10K
W
Load
Offset Voltage
(Guaranteed, not tested)
VDD
IDD
IEE
VIL
VIH
VILX
VIHX
IIN
CI
RSEG
RBP
IDOH
IDOL
VEE
C
IDD
VEE
C
VOS
3.0
Static, No Load
Static, No Load
0
2
VEE
0.8 VDD
VIN = 0 to 5V
IL = 10µA
IL = 10µA
VOH = 4.5
VOL = 0.4
See Fig. 2
See Fig. 2
See Fig. 2
See Fig. 4
300
7.0
600
120
0.8
VDD
0.6 VDD
VDD
100
5
15,000
600
-3.0
-21
1.8
25
3.2
-22
-20
-21.5
V
µA
µA
V
V
V
V
nA
pF
W
W
mA
mA
V
mA
V
mV
AC ELECTRICAL CHARACTERISTICS
VDD = 5V , VEE = -21.5V, VSS = 0V, TA = Operating temperature range (unless otherwise specified).
编译自semiengineering 业界越来越关注人工智能的功耗问题，但这个问题并没有简单的解决方案。这需要深入了解应用、半导体和系统层面的软件和硬件架构，以及所有这些的设计和实现方式。每个环节都会影响总功耗和提供的效用。这是最终必须做出的权衡。 但首先，必须解决效用问题。电力是否被浪费了？“我们将电力用于有价值的用途，”Ansys（现为新思科技旗下公司）产品营销总监 Marc Swi...[详细]
单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
