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IC-HT Datasheet(PDF) 2 Page - IC-Haus GmbH |
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IC-HT Datasheet(HTML) 2 Page - IC-Haus GmbH |
2 / 45 page prel imin ary prel imin ary iC-HT DUAL CW LASER DIODE DRIVER Rev B1, Page 2/45 DESCRIPTION Dual CW laser diode driver iC-HT can operate two in- dividual laser diodes with up to 750 mA laser current depending on the heat dissipation. Each channel can be enabled independently. The laser diode driver can be controlled by an external microcontroller (MCU mode) or operate stand alone with pin/resistor config- uration (iC-WK mode). In MCU mode, both channels can be combined for driving up to 1500 mA. Each channel can be operated individually either in automatic current control (ACC) or automatic power control (APC). All parameters including the internal reference voltages are set via serial communication (I2C or SPI). A 10 bit resolution D/A converter with logarithmic characteristic is used for setting the oper- ating point. This allows an operating point resolution better than 1%. In APC control, the monitor diode photocurrent is used to track the optically emitted power of the laser diode. The feedback for the laser diode driver is the voltage of the photocurrent at a monitor resistor. An 8 bit internal programmable logarithmic monitor resis- tor (PLR) or an external monitor resistor can be se- lected for closing the control loop. The PLR ranges from 100 Ω to 500 kΩ with a step width less than 5%. In ACC control, the laser diode current can be set directly. Two current ranges are selectable. iC-HT allows disabling the laser channels when an overcurrent threshold has been exceeded. The over- current threshold of each channel has 2 ranges and is programmable through an 8 bit linear D/A con- verter. The temperature monitor measures the internal chip temperature. iC-HT disables the laser channels when overtemperature is detected. A variety of voltages can be measured with a 10 bit A/D converter. The following voltages can be mea- sured: • V(LDKx) • V(VDD) • V(VB) • V(MDAx) • V(PLRx) The DCO current output pin can control an external DC/DC converter. Controlling the DC/DC output volt- age can optimize the power dissipation of the whole system e.g. to extend battery life. iC-HT in standby mode has a very low current con- sumption (< 10 µA) and does retain its configuration. The device features for safe operation: • Configuration verification • Tri-state configuration pins • Write protection in operating mode • Safe default/startup state |
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