收藏本站
MAX44009
Industry’s Lowest-Power
Ambient Light Sensor with ADC
I 2 C Serial Interface
The IC features an I 2 C/SMBus?-compatible, 2-wire
serial interface consisting of a serial-data line (SDA) and
a serial-clock line (SCL). SDA and SCL facilitate com-
munication between the IC and the master at clock rates
up to 400kHz. Figure 3 shows the 2-wire interface timing
diagram. The master generates SCL and initiates data
transfer on the bus. A master device writes data to the
IC by transmitting the proper slave address followed by
the register address and then the data word. Each trans-
mit sequence is framed by a START (S) or Repeated
START (Sr) condition and a STOP (P) condition. Each
word transmitted to the IC is 8 bits long and is followed
by an acknowledge clock pulse. A master reading data
from the IC transmits the proper slave address followed
by a series of nine SCL pulses. The IC transmits data
on SDA in sync with the master-generated SCL pulses.
The master acknowledges receipt of each byte of data.
Each read sequence is framed by a START or Repeated
START condition, a not acknowledge, and a STOP condi-
tion. SDA operates as both an input and an open-drain
output. A pullup resistor, typically greater than 500 I , is
required on the SDA bus. SCL operates as only an input.
A pullup resistor, typically greater than 500 I , is required
on SCL if there are multiple masters on the bus, or if the
master in a single-master system has an open-drain SCL
output. Series resistors in line with SDA and SCL are
optional. Series resistors protect the digital inputs of the
SDA
IC from high-voltage spikes on the bus lines, and mini-
mize crosstalk and undershoot of the bus signals.
Bit Transfer
One data bit is transferred during each SCL cycle. The
data on SDA must remain stable during the high period
of the SCL pulse. Changes in SDA while SCL is high are
control signals (see the START and STOP Conditions
section). SDA and SCL idle high when the I 2 C bus is not
busy.
START and STOP Conditions
SDA and SCL idle high when the bus is not in use. A
master initiates communication by issuing a START con-
dition. A START condition is a high-to-low transition on
SDA with SCL high. A STOP condition is a low-to-high
transition on SDA while SCL is high (Figure 4). A START
condition from the master signals the beginning of a
transmission to the IC. The master terminates transmis-
sion, and frees the bus by issuing a STOP condition. The
bus remains active if a REPEATED START condition is
generated instead of a STOP condition.
Early STOP Conditions
The IC recognizes a STOP condition at any point during
data transmission except if the STOP condition occurs in
the same high pulse as a START condition. For proper
operation, do not send a STOP condition during the
same SCL high pulse as the START condition.
tLOW
tSU,DAT
tHD,DAT
tSU,STA
tHD,STA
tSP
tSU,STO
tBUF
SCL
tHIGH
tHD,STA
START
CONDITION
tR
tF
REPEATED
START CONDITION
STOP
CONDITION
START
CONDITION
Figure 3. 2-Wire Interface Timing Diagram
SMBus is a trademark of Intel Corp.
Maxim Integrated
15
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
MAX4473EUA+T IC AMP PA PWR GSM CONTROL 8-MSOP
MAX6503UKP005+T IC TEMP SWITCH MICROPWR SOT23-5
MAX6506UTP050+T IC TEMP SWITCH DL TRIP SOT23-6
MAX6515UKN035+T IC SW TEMP SOT23-5
MAX6516UKP075+T IC SW TEMP SENSOR SOT23-5
MAX6575HZUT+T IC TEMP SENSOR DGTL SOT23-6
MAX6577ZUT-T IC TEMP SNSR PER/FREQOUT SOT23-6
MAX66000K-000AA+ IC RFID UID 64BIT TYPE B KEY FOB
相关代理商/技术参数
MAX44009EVKIT# 功能描述:光学传感器开发工具 MAX44009 Eval Kit RoHS:否 制造商:ams 工具用于评估: 接口类型: 最大工作温度:
MAX44009EVKIT+ 功能描述:近程传感器 Digital Ambient Light Sensor RoHS:否 制造商:Vishay Semiconductors 感应方式:Optical 感应距离:1 mm to 200 mm 电源电压:2.5 V to 3.6 V 安装风格:SMD/SMT 输出配置:Digital 最大工作温度:+ 85 C 最小工作温度:- 25 C 系列:VCNL3020
MAX44009PMB1# 功能描述:环境光传感器 740MHzOp Amp RoHS:否 制造商:Vishay Semiconductors 工作电源电压: 峰值波长:570 nm 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:T-1 封装:Bulk
MAX4400ASA 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX4400AUK 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL/QUAD LOW-COST SINGLE-SUPPLY RAIL-TO-RAIL OP AMPS - Rail/Tube
MAX4400AUK+ 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R O/P 5.5V 5PIN SOT-23 - Rail/Tube
MAX4400AUK+T 功能描述:运算放大器 - 运放 Single-Supply Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel
MAX4400AUK-T 功能描述:运算放大器 - 运放 Single-Supply Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel