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| 型号： | MAX6969EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX6969 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 55mA |
| 输出及类型： | 16，非隔离 |
| 输出电压： | 5.5V |
| 特点： | 6个 7 段显示器，USB 接口 |
| 输入电压： | 3 ~ 5.5 V |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | MAX6969 |
16-Port, 5.5V Constant-Current LED Driver
Detailed Description
The MAX6969 LED driver comprises a 4-wire serial
interface driving 16 constant-current-sinking, open-
drain output ports. The outputs drive LEDs in either
static or multiplex applications (Figure 1). The constant-
current outputs are guaranteed for current accuracy
not only with chip-supply voltage variations (5V ±10%
and 3V to 5.5V), but also over a realistic range of driver
output voltage drop (0.5V to 2.5V). The drivers use cur-
rent-sensing feedback circuitry (not simple current mir-
rors) to ensure very small current variations over the full
allowed range of output voltage (see the Typical
Operating Characteristics ).
The 4-wire serial interface comprises a 16-bit shift reg-
ister and a 16-bit transparent latch. The shift register is
written through a clock input, CLK, and a data input,
DIN, and the data propagates to a data output, DOUT.
The data output allows multiple drivers to be cascaded
and operated together. The contents of the 16-bit shift
register are loaded into the transparent latch through a
latch-enable input, LE. The latch is transparent to the
shift register outputs when high, and latches the current
state on the falling edge of LE.
LE
Each driver output is an open-drain, constant-current
sink that should be connected to the cathode of either
a single LED or a series string of multiple LEDs. The
LED anode can be connected to a supply voltage of up
to 5.5V, independent of the MAX6969 supply, V+. The
constant-current capability is up to 55mA per output,
set for all eight outputs by an external resistor, R SET .
Initial Power-Up and Operation
An internal reset circuit clears the internal registers of
the MAX6969 on power-up. All outputs (OUT0–OUT15)
initialize to high impedance, regardless of the initial
logic levels of the CLK, DIN, OE , and LE inputs.
4-Wire Serial Interface
The serial interface on the MAX6969 is a 4-wire serial
interface using four inputs (DIN, CLK, LE, OE ) and a
data output (DOUT). This interface is used to write dis-
play data to the MAX6969. The serial-interface data
word length is 16 bits, D0–D15. See Figure 2.
The functions of the five interface pins are as follows.
DIN is the serial-data input, and must be stable when it
is sampled on the rising edge of CLK. Data is shifted in,
MSB first. This means that data bit D15 is clocked in
first, followed by 15 more data bits finishing with the
LSB, D0.
t LW
t CL
t CH
t CP
t LS
CLK
t DH
t DS
DIN
D15
D14
D1
D0
t DO
DOUT
OE
t OEL
t OEW
t OEH
D7
80%
.
OUT_
Figure 2. 4-Wire Serial-Interface Timing Diagram
t f
20%
t r
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6969EVKIT+ | 功能描述:LED 照明开发工具 MAX6969 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX696C/D | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX696C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX696CPE | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX696CPE+ | 功能描述:监控电路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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