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參數(shù)資料
| 型號： | MAX6852 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 4-Wire Interfaced, 5 x 7 Matrix Vacuum- Fluorescent Display Controller |
| 中文描述： | 4線接口、5 x 7點陣、真空熒光顯示控制器 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 489K |
| 代理商： | MAX6852 |
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M
4-Wire Interfaced, 5
7 Matrix Vacuum-
Fluorescent Display Controller
20
______________________________________________________________________________________
The multiplex clock frequency determines the multiplex
scan rate and the blink timing. The display scan rate is
{OSC / 400 / (1 + grids register value)}. There are 400
OSC cycles per digit multiplex period. For example,
with OSC = 4MHz, each display digit is enabled for
100μs. For a 40-grid display tube (grids register value
= 39 or 0x27), the display scan rate is 250Hz.
The BLINK output is the selectable blink period clock. It
is nominally 0.5Hz or 1Hz (OSC = 4MHz). It is low dur-
ing the first half of the blink period, and high during the
second half. The PORT0 and PORT1 general-purpose
outputs may be programmed to be BLINK output.
Synchronize the BLINK timing if desired by setting the
T bit in the configuration register (Table 19).
The RC oscillator uses an external resistor R
OSC
and
an external capacitor C
OSC
to set the oscillator fre-
quency. R
OSC
connects from OSC2 to ground. C
OSC
connects from OSC1 to ground. The recommended val-
ues of R
OSC
and C
OSC
set the oscillator to 4MHz,
which makes the BLINK frequencies 0.5Hz and 1 Hz:
f
OSC
= K
F
/ (R
OSC
x [C
OSC
+ C
STRAY
]) MHz
where:
K
F
= 2320
R
OSC
= external resistor in k
(allowable range 8k
to
80k
)
C
OSC
= external capacitor in pF
C
STRAY
= stray capacitance from OSC1 to GND in pF,
typically 2pF
For OSC = 4MHz, R
OSC
is 10k
and C
OSC
is 56pF.
The effective value of C
OSC
includes not only the actual
external capacitor used, but also the stray capacitance
from OSC1 to GND. This capacitance is usually in the
1pF-to-5pF range, depending on the layout used.
The allowed range of f
OSC
is 2MHz to 8MHz. If f
OSC
is
set too high, the internal oscillator can stop working. An
internal fail-safe circuit monitors the multiplex clock and
detects a slow or nonworking multiplex clock. When a
slow or nonworking multiplex clock is detected, an
internal fail-safe oscillator generates a replacement
clock of about 200kHz. This backup clock ensures that
the VFD is not damaged by the multiplex operation halt-
ing inadvertently. The scan rate for 16 digits is about
15Hz in fail-safe mode, and the display flickers. A flick-
ering display is a good indication that there is a prob-
lem with the multiplex clock.
Power Supplies
The MAX6852 operates from a single 2.7V to 3.6V
power supply. Bypass the power supply to GND with a
0.1μF capacitor as close to the device as possible. Add
a bulk capacitor (such as a low-cost electrolytic 1μF to
22μF) if the MAX6852 is driving high current from any of
the general-purpose output ports.
COMMAND
ADDRESS
REGISTER
DATA
READ OR
WRITE
FUNCTION
0x85
0x00
–
0x7F
Read
Read 7-bit user-definable font data entry from current font address. MSB of the
register data is clear. Font address pointer is incremented after the read.
0x05
0x00
–
0x7F
Write
Write 7-bit user-definable font data entry to current font address. Font address
pointer is incremented after the write.
0x05
0x80
–
0xFF
Write
Write font address pointer with the register data.
Table 8. Memory Mapping of User-Defined Font Register 0x05
FONT POINTER
ADDRESS
ACTION
0x80 to 0xF6
Valid range to set the font address pointer. Pointer autoincrements after a font data read or write, while pointer
address remains in this range.
0xF7
Further font data is ignored after a font data read or write to this pointer address.
Invalid range to set the font address pointer. Pointer is set to 0x80.
0xF8 to 0xFF
Table 9. Font Pointer Address Behavior
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6852AEE | 功能描述:VFD驅(qū)動器 RoHS:否 制造商:Maxim Integrated 工作電源電壓:8 V to 76 V, 3 V to 5.5 V 電源電流:0.9 mA, 700 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SOIC-20 封裝:Tube |
| MAX6852AEE+ | 功能描述:VFD驅(qū)動器 Integrated Circuits (ICs) PMIC - Display Drivers - IC VFD CTRLR MATRIX 16QSOP RoHS:否 制造商:Maxim Integrated 工作電源電壓:8 V to 76 V, 3 V to 5.5 V 電源電流:0.9 mA, 700 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SOIC-20 封裝:Tube |
| MAX6852AEE+T | 功能描述:VFD驅(qū)動器 Integrated Circuits (ICs) PMIC - Display Drivers - IC VFD CTRLR MATRIX 16QSOP RoHS:否 制造商:Maxim Integrated 工作電源電壓:8 V to 76 V, 3 V to 5.5 V 電源電流:0.9 mA, 700 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SOIC-20 封裝:Tube |
| MAX6852AEE-T | 功能描述:VFD驅(qū)動器 RoHS:否 制造商:Maxim Integrated 工作電源電壓:8 V to 76 V, 3 V to 5.5 V 電源電流:0.9 mA, 700 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SOIC-20 封裝:Tube |
| MAX6853AEE | 功能描述:VFD驅(qū)動器 RoHS:否 制造商:Maxim Integrated 工作電源電壓:8 V to 76 V, 3 V to 5.5 V 電源電流:0.9 mA, 700 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SOIC-20 封裝:Tube |
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