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參數資料
| 型號： | MAX7219ENG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 顯示驅動器 |
| 英文描述： | Serially Interfaced, 8-Digit LED Display Drivers |
| 中文描述： | LED DISPLAY DRIVER, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, DIP-24 |
| 文件頁數： | 6/16頁 |
| 文件大小： | 186K |
| 代理商： | MAX7219ENG |
MSB
M
S erially Interfac ed, 8-Digit LED Display Drivers
6
_______________________________________________________________________________________
_______________Detailed Desc ription
MAX 7219/MAX 7221 Differenc es
The MAX7219 and MAX7221 are identical except for
two parameters: the MAX7221 segment drivers are
slew-rate limited to reduce electromagnetic interfer-
ence (EMI), and its serial interface is fully SPI compati-
ble.
S erial-Addressing Modes
For the MAX7219, serial data at DIN, sent in 16-bit
packets, is shifted into the internal 16-bit shift register
with each rising edge of CLK regardless of the state of
LOAD. For the MAX7221,
CS
must be low to clock data
in or out. The data is then latched into either the digit or
control registers on the rising edge of LOAD/
CS
.
LOAD/
CS
must go high concurrently with or after the
16th rising clock edge, but before the next rising clock
edge or data will be lost. Data at DIN is propagated
through the shift register and appears at DOUT 16.5
clock cycles later. Data is clocked out on the falling
edge of CLK. Data bits are labeled D0–D15 (Table 1).
D8–D11 contain the register address. D0–D7 contain
the data, and D12–D15 are “don’t care” bits. The first
received is D15, the most significant bit (MSB).
Digit and Control Registers
Table 2 lists the 14 addressable digit and control regis-
ters. The digit registers are realized with an on-chip,
8x8 dual-port SRAM. They are addressed directly so
that individual digits can be updated and retain data as
long as V+ typically exceeds 2V. The control registers
consist of decode mode, display intensity, scan limit
(number of scanned digits), shutdown, and display test
(all LEDs on).
S hutdown Mode
When the MAX7219 is in shutdown mode, the scan oscil-
lator is halted, all segment current sources are pulled to
ground, and all digit drivers are pulled to V+, thereby
blanking the display. The MAX7221 is identical, except
the drivers are high-impedance. Data in the digit and
control registers remains unaltered. Shutdown can be
used to save power or as an alarm to flash the display by
successively entering and leaving shutdown mode. For
minimum supply current in shutdown mode, logic inputs
should be at ground or V+ (CMOS-logic levels).
Typically, it takes less than 250μs for the MAX7219/
MAX7221 to leave shutdown mode. The display driver
can be programmed while in shutdown mode, and
shutdown mode can be overridden by the display-test
function.
CLK
DIN
D15
DOUT
D14
D1
D0
t
CSS
t
CL
t
CH
t
CP
t
DO
t
LDCK
t
CSW
t
CSH
t
DS
t
DH
CS
OR LOAD
Figure 1. Timing Diagram
Table 1. Serial-Data Format (16 Bits)
D14
D15
X
D12
D13
X
X
D10
D11
D8
D9
ADDRESS
D6
D7
D4
D5
X
D2
D3
D0
D1
MSB
DATA
LSB
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX7219ENG+ | 功能描述:LED顯示驅動器 8-Digit LED Display Driver RoHS:否 制造商:Micrel 數位數量:5 片段數量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX7219ERG | 功能描述:LED顯示驅動器 RoHS:否 制造商:Micrel 數位數量:5 片段數量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX7219ERG+ | 功能描述:LED顯示驅動器 RoHS:否 制造商:Micrel 數位數量:5 片段數量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX7219EWG | 功能描述:LED顯示驅動器 Integrated Circuits (ICs) RoHS:否 制造商:Micrel 數位數量:5 片段數量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX7219EWG+ | 功能描述:LED顯示驅動器 8-Digit LED Display Driver RoHS:否 制造商:Micrel 數位數量:5 片段數量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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