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MAX7300AAX+ 产品设计参考手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
接口芯片
封装:
SSOP-36
描述:
MAXIM INTEGRATED PRODUCTS MAX7300AAX+ 输入/输出扩展, 400 kHz, I2C, 2.5 V, 5.5 V, SSOP
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MAX7300AAX+数据手册
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Figure 1. Application circuit for the MAX6956.
MAX6956 Configuration Registers
The detailed operation of the MAX6956 is controlled by writing to its 89 registers. In addition to the four
registers (Global Current, Configuration, Transition Detection Mask, and Display Test) described in the
data sheet, the MAX6956 provides three additional groups of registers:
1. Port Configuration (0x09 to 0x0F)
There are two bits for each port in the Port Configuration register. These bits are used to define
each port as an LED driver, output port, or input port with/without a pullup resistor. There are 7 Port
Configuration registers corresponding to 28 ports.
2. Individual Current (0x12 to 0x1F)
There are four bits for each port in an Individual Current register. These bits are used to define the
desired constant-current level of an individual port. The minimum increment is 1/16 of the maximum
level set by the external resistor connected to the I
SET
pin.
3. Port I/O Value (0x20 to 0x5F)
There are 29 Port I/O Value registers corresponding to each individual port (port 31 has two
registers). There are 21 Port I/O Value registers that can be used to simultaneously define I/O
values for a group of 8 different ports. The rest of the Port I/O Value registers can be used to
simultaneously define a group of 2, 3, 4, 5, 6, or 7 different ports.
MAX6956 I²C Commands
Below are I²C commands for setting all ports to half of the maximum constant-current level of 24mA
(based on a 39kΩ external resistor) at power-up. The I²C-device address of the MAX6956 is 0x80 when
both AD0 and AD1 pins are connected to ground. The I2CWrite routine issues a write command to a
MAX6956 register with a particular byte or a sequence of registers with multiple bytes by taking
advantage of the register-address autoincrement feature.
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