参数资料
型号: MAX6957ATL+T
厂商: Maxim Integrated
文件页数: 7/25页
文件大小: 0K
描述: IC DRVR DSPL LED 40-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
显示器类型: LED
配置: 7、16、20 段
接口: 4 线串行
电流 - 电源: 180µA
电源电压: 2.5 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘
供应商设备封装: 40-TQFN-EP(6x6)
包装: 带卷 (TR)
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port LED Display Driver and I/O Expander
P4 TO P31
INTENSITY
TEST
CONFIGURATION
INTENSITY REGISTERS
TEST REGISTER
PORT REGISTERS
MASK REGISTER
LED DRIVERS
OR GPIO
LED DRIVERS AND GPIO
PORT CHANGE
DETECTOR
CONFIGURATION
REGISTERS
R/W
DATA
CE
8
SEGMENT OR
GPIO DATA
R/W
8
COMMAND
REGISTER DECODE
8
DATA BYTE
COMMAND BYTE
8
CS
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
DIN
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
DOUT
SCLK
Figure 1. MAX6957 Functional Diagram
Shutdown
When the MAX6957 is in shutdown mode, all ports are
forced to inputs, and the pullup current sources are
turned off. Data in the port and control registers remain
unaltered so port configuration and output levels are
restored when the MAX6957 is taken out of shutdown.
The display driver can still be programmed while in
shutdown mode. For minimum supply current in shut-
down mode, logic inputs should be at GND or V+
potential. Shutdown mode is exited by setting the S bit
in the configuration register (Table 6). Shutdown mode
is temporarily overridden by the display test function.
Serial Interface
The MAX6957 communicates through an SPI-compati-
ble 4-wire serial interface. The interface has three
inputs, Clock (SCLK), Chip Select ( CS ), and Data In
(DIN), and one output, Data Out (DOUT). CS must be
low to clock data into or out of the device, and DIN
must be stable when sampled on the rising edge of
SCLK. DOUT provides a copy of the bit that was input
15.5 clocks earlier, or upon a query it outputs internal
register data, and is stable on the rising edge of SCLK.
Note that the SPI protocol expects DOUT to be high
impedance when the MAX6957 is not being
accessed; DOUT on the MAX6957 is never high
impedance. Go to www.maxim-ic.com/an1879 for
ways to convert DOUT to tri-state, if required.
SCLK and DIN may be used to transmit data to other
peripherals, so the MAX6957 ignores all activity on
SCLK and DIN except between the fall and subsequent
rise of CS.
_______________________________________________________________________________________
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