- 您现在的位置：买卖IC网 > Sheet目录985 > ISL76683EVAL1Z (Intersil)BOARD EVALUATION FOR ISL76683
ISL76683
Principles of Operation
Photodiodes
The ISL76683 contains two photodiodes. Diode1 is sensitive to
both visible and infrared light, while Diode2 is mostly sensitive to
infrared light. The spectral response of the two diodes are
independent from one another. See Figure 2, “SPECTRAL
RESPONSE,” on page 4 in the “Typical Performance Curves”
section. The photodiodes convert light to current then the diodes’
current outputs are converted to digital by a single built-in
integrating type 16-bit Analog-to-Digital Converter (ADC). An I 2 C
command mode determines which photodiode will be converted
to a digital signal. Mode1 is Diode1 only. Mode2 is Diode2 only.
Mode3 is a sequential Mode1 and Mode2 with an internal subtract
function (Diode1 - Diode2).
Analog-to-Digital Converter (ADC)
The converter is a charge-balancing integrating type 16-bit ADC.
The chosen method for conversion is best for converting small
current signals in the presence of AC periodic noise. A 100ms
integration time, for instance, highly rejects 50Hz and 60Hz
The built-in ADC offers the user flexibility in integration time or
conversion time. Two timing modes are available; Internal Timing
Mode and External Timing Mode. In Internal Timing Mode,
integration time is determined by an internal dual speed oscillator
(f OSC ), and the n-bit (n = 4, 8, 12, 16) counter inside the ADC. In
External Timing Mode, integration time is determined by the time
between two consecutive I 2 C External Timing Mode commands. See
integration time and resolution depending on the application is
required for optimal results.
The ADC has four I 2 C programmable range selects to
dynamically accommodate various lighting conditions. For very
dim conditions, the ADC can be configured at its lowest range.
For very bright conditions, the ADC can be configured at its
highest range.
Interrupt Function
The active low interrupt pin is an open drain pull-down
configuration. The interrupt pin serves as an alarm or monitoring
function to determine whether the ambient light exceeds the
upper threshold or goes below the lower threshold. The user can
also configure the persistency of the interrupt pin. This
eliminates any false triggers, such as noise or sudden spikes in
ambient light conditions. An unexpected camera flash, for
example, can be ignored by setting the persistency to 8
integration cycles.
I 2 C Interface
There are eight (8) 8-bit registers available inside the ISL76683. The
command and control registers define the operation of the device.
The command and control registers do not change until the registers
are overwritten. There are two 8-bit registers that set the high and
low interrupt thresholds. There are four 8-bit data Read Only
registers; two bytes for the sensor reading and another two bytes for
the timer counts. The data registers contain the ADC's latest digital
output, and the number of clock cycles in the previous integration
period.
The ISL76683’s I 2 C interface slave address is hardwired
internally as 1000100. When 1000100x with x as R or W is sent
after the Start condition, this device compares the first seven bits
of this byte to its address and matches.
Figure 12 shows a sample one-byte read. Figure 13 shows a
sample one-byte write. Figure 14 shows a sync_iic timing
diagram sample for externally controlled integration time. The
I 2 C bus master always drives the SCL (clock) line, while either the
master or the slave can drive the SDA (data) line. Figure 13
shows a sample write. Every I 2 C transaction begins with the
master asserting a start condition (SDA falling while SCL remains
high). The following byte is driven by the master and includes the
slave address and read/write bit. The receiving device is
responsible for pulling SDA low during the acknowledgement
period.
Every I 2 C transaction ends with the master asserting a stop
condition (SDA rising while SCL remains high).
For more information about the I 2 C standard, please consult the
Philips? I 2 C specification documents.
6
FN7697.7
March 24, 2014
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ISL97632IRTZ-EVALZ
EVAL BOARD FOR ISL97632IRTZ
ISL97671IRZ-EVALZ
BOARD EVALUATION FOR ISL97671
ISL97684IRTZEVALZ
EVAL BOARD LED DRIVER
ISL97801BOOSTEVALZ
EVAL BOARD FOR ISL97801
ISLA118P50IR72EV1Z
EVAL BOARD FOR ISLA118P50IR74
ISLA224IR72EV1Z
BOARD EVALUATION FOR ISLA224P
ISPTPKIT
SCREW KIT TAMPER RESISTANT 9PCS
ITCSN-0400-25-U
HEATSHRINK ITCSN 2/5" X 25'
相关代理商/技术参数
ISL78010
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Automotive Grade TFT-LCD Power Supply
ISL78010_11
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Automotive Grade TFT-LCD Power Supply
ISL78010ANZ
功能描述:直流/直流开关调节器 AUTO GRD TFT-LCD PWR SUPPLY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
ISL78010ANZ-T
功能描述:直流/直流开关调节器 AUTO GRD TFT-LCD PWR SUPPLY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
ISL78010EVAL1Z
功能描述:EVAL BOARD 1 FOR ISL78010 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
ISL78020
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Automotive Grade TFT-LCD DC/DC with Integrated Amplifiers
ISL78020ANZ
制造商:Intersil Corporation 功能描述:CONV DC-DC SGL-OUT STEP UP 32TQFP - Trays 制造商:Intersil 功能描述:AUTO GRD TFT-LCD DC- DC W/INTEGRTD AMP
ISL78020ANZ-T
制造商:Intersil Corporation 功能描述:CONV DC-DC SGL-OUT STEP UP 32TQFP - Tape and Reel 制造商:Intersil 功能描述:AUTO GRD TFT-LCD DC- DC W/INTEGRTD AMP