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參數(shù)資料
| 型號(hào)： | MAX6851AEE-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 顯示控制器 |
| 英文描述： | 2-Wire Interfaced, 7-, 14-, and 16-Segment Alphanumeric Vacuum-Fluorescent Display Controller |
| 中文描述： | FLUORESCENT DSPL CTRL, PDSO16 |
| 封裝： | 0.150 INCH, 0.635 MM PITCH, QSOP-16 |
| 文件頁數(shù)： | 25/37頁 |
| 文件大小： | 493K |
| 代理商： | MAX6851AEE-T |
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MAX6851
2-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-
numeric Vacuum-Fluorescent Display Controller
______________________________________________________________________________________
31
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
100s. 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 20).
The RC oscillator uses an external resistor ROSC and
an external capacitor COSC to set the oscillator fre-
quency. ROSC connects from OSC2 to ground. COSC
connects from OSC1 to ground. The recommended val-
ues of ROSC and COSC set the oscillator to 4MHz,
which makes the BLINK frequencies 0.5Hz and 1 Hz:
fOSC = KF / (ROSC x [COSC + CSTRAY]) MHz
where:
KF = 2320
ROSC = external resistor in k
(allowable range 8k to
80k
)
COSC = external capacitor in pF
CSTRAY = stray capacitance from OSC1 to GND in pF,
typically 2pF
For OSC = 4MHz, ROSC is 10k
and COSC is 56pF
The effective value of COSC 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 fOSC is 2MHz to 8MHz. If fOSC 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 grids is about
30Hz 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 MAX6851 operates from a single 2.7V to 3.6V
power supply. Bypass the power supply to GND with a
0.1F capacitor as close to the device as possible. Add
a bulk capacitor (such as a low-cost electrolytic 1F to
22F) if the MAX6851 is driving high current from any of
the general-purpose output ports.
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| MAX6852AEE | 功能描述:VFD驅(qū)動(dòng)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(dòng)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(dòng)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(dòng)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(dòng)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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