收藏本站
SMBus/I 2 C Interfaced 4-Port, Level-Translating
GPIOs and LED Drivers
the host processor of data changes at the selected
inputs. Reset INT by reading any port’s I/O registers
(0x01 to 0x04).
Standby Mode
Upon power-up, the MAX7306/MAX7307 enter standby
mode when the serial interface is idle. If any of the PWM
intensity control, blink, or debounce features are used,
the operating current rises because the internal PWM
oscillator is running and toggling counters. When using
OSCIN to override the internal oscillator, the operating
current varies according to the frequency at OSCIN.
When the serial interface is active, the operating current
also increases because the MAX7306/MAX7307, like all
I 2 C slaves, have to monitor every transmission. The bus
timeout circuit and debounce circuit use the internal oscil-
lator even if OSCIN is selected.
Internal Oscillator and OSCIN/OSCOUT
External Clock Options
The MAX7306/MAX7307 contain an internal oscillator
nominally at 32kHz. The MAX7306/MAX7307 always use
the internal oscillator for bus timeout and for debounce
timing (when enabled). The internal oscillator is also
used by default to generate PWM and blink timing. The
internal oscillator only runs when the clock output
OSCOUT is needed to keep the operating current as
low as possible.
The MAX7306/MAX7307 can use an external clock
source instead of the internal oscillator for the PWM
and blink timing. The external clock can range from DC
to 1MHz and it connects to the P2/OSCIN port. The
P3/OSCOUT port provides a buffered and level-shifted
output of the internal oscillator or external clock to drive
other devices. Select the P2/OSCIN and P3/OSCOUT
port options using the device configuration register
0x27 bits D2 and D3 (see Table 2).
The P2/OSCIN port is overvoltage protected to supply
voltage V LA for the MAX7307, so the external clock can
exceed V DD if V LA is greater than V DD . The external
clock cannot exceed V DD for the MAX7306. The port P2
register (see Tables 2 and 6) sets the P2/OSCIN logic
threshold (30%/70%) to either the V DD supply or the V LA .
Use OSCOUT or an external clock source to cascade
up to four MAX7306s per master for applications requir-
ing additional ports. To synchronize the blink action
across multiple MAX7306s (see Figures 4 and 5), use
OSCOUT from one MAX7306 to drive OSCIN of the
other MAX7306s. This process ensures the same blink
frequency of all the devices, but also make sure to syn-
chronize the blink phase. The blink timing of multiple
MAX7306s is synchronous at the instant of power-up
because the blink and PWM counters clear by each
device ’s internal reset circuit, and by default the
device’s internal oscillators are off upon power-up.
Ensure that the blink phase of all the devices remains
synchronized by programming the OSCIN and
OSCOUT functionality before programming any feature
that causes a MAX7306’s internal oscillator to operate
(blink, PWM, bus timeout, or key debounce). Configure
the RST input to reset the internal timing counters used
for PWM and blink by setting bit D1 of device configu-
ration register 0x26 (see Table 3).
MAX7306/MAX7307
P3/OSCOUT
MAX7306/MAX7307
MAX7306/MAX7307
P2/OSCIN
MAX7306/MAX7307
MAX7306/MAX7307
P2/OSCIN
MAX7306/MAX7307
P3/OSCOUT
P2/OSCIN
P3/OSCOUT
P2/OSCIN
Figure 4. Synchronizing Multiple MAX7306/MAX7307s (Internal Oscillator)
14
______________________________________________________________________________________
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MAX831EVKIT-SO EVAL KIT FOR MAX831
MAX8513EVKIT EVAL KIT FOR MAX8513
MAX8552EUB+ IC DRIVER MOSFET HS 10-UMAX
MAX8595XETA+T IC LED DRIVR WHITE BCKLGT 8-TDFN
MAX8607ETD+T IC LED DRIVR PHOTO FLASH 14-TDFN
MAX8608YETD+T IC LED DRVR WT/OLED BCKLT 14TDFN
MAX8631XETI+T IC LED DRVR WHITE BCKLGT 28-TQFN
MAX8645YETI+T IC LED DRVR WHITE BCKLGT 28-TQFN
相关代理商/技术参数
MAX7307EVKIT+ 制造商:Maxim Integrated Products 功能描述:MAX7307 EVAL KIT/EVAL SYS - Rail/Tube
MAX730A 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX730AC/D 功能描述:直流/直流开关转换器 DICE SALES DICE RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX730AC/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX730ACPA 功能描述:直流/直流开关转换器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX730ACPA+ 功能描述:直流/直流开关转换器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX730ACSA 功能描述:直流/直流开关转换器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX730ACSA+ 功能描述:直流/直流开关转换器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT