Smart home and Internet of Things devices are already the hottest types of technology products at present. In order to provide the best performance and standby time for these products, the relevant power supply and storage devices must be equipped. This article will show you the low dropout (LDO) linear regulator and EEPROM introduced by onsemi, which will be your best partner for smart home applications and Internet of Things devices.
LDO regulators support long battery life
An LDO is a linear regulator. Compared with the general linear DC regulator, a low dropout regulator can work with smaller output-input voltage differences. The power transistor used by the low dropout regulator can be either a bipolar transistor or a field effect transistor (FET), eliminating the excess voltage from the applied input voltage to generate a regulated output voltage. The so-called voltage drop refers to the minimum value of the difference between the input voltage and the output voltage required by the regulator to maintain the output voltage within 100mV above and below its rated value.
An LDO linear regulator usually has the following outstanding advantages: very low self-noise and high power supply rejection ratio (PSRR), low cost and low quiescent current. It also requires very few external components, usually only one or two bypass capacitors. If the input voltage and the output voltage are very close, it is best to choose an LDO regulator which can achieve high efficiency. Therefore, LDO regulators are mostly used in applications that convert lithium ion battery voltages into 3V output voltages, because they can ensure long battery life and low noise.
NCP110 LDO regulator with ultra-high PSRR
onsemi produces LDO linear regulators in many specifications to meet the different requirements of various applications. The NCP110 linear regulator introduced by onsemi can provide a 200 mA output current from a 1.1 V input voltage. The device offers a wide output range of 0.6 V to 4.0 V and has a unique combination of very low voltage, very low noise, high PSRR, and low quiescent current, making it ideal for high precision analog and Wi-Fi applications. Through an innovative new architecture, it provides a low quiescent current, low Vin, and dropout voltage. NCP110 is suitable for battery-powered devices such as smart phones, tablets, and wireless IoT modules. The device is designed to operate with 1 µF input and 1 µF output ceramic capacitors. It is available in ultra-small 0.35P, 0.64 mm x 0.64 mm chip scale packages (CSP) and XDFN4 0.65P (1 mm x 1 mm) packages.
The NCP110 linear regulator operates from an input voltage of 1.1 V to 5.5 V, available in fixed voltage options ranging from 0.6 V to 4.0 V, with ± 2% over load/temperature accuracy, ultralow quiescent current of 20 µA typical, standby current of only 0.1 µA typical, low dropout, 70 mV at 100 mA, 1.05 V, high PSRR support, 95 dB typical at 20 mA, f = 1 kHz, ultralow noise of 8.8 µVRMS, Pb-free, halogen-free/brominated flame retardant (BFR), and RoHS compliant.
Typical applications of the NCP110 linear regulator include battery-powered applications and devices, noise-sensitive applications, power-sensitive devices, space-constrained applications, end products including smart phones, smart watches, tablets, digital cameras, wireless Bluetooth headsets, smoke detectors, portable medical equipment, as well as power supplies for RF, PLL, VCO and clocks, and the NCP110 linear regulator can also be applied to battery-powered wireless Internet of Things modules.
NCP170 LDO regulators support ultralow quiescent currents
NCP170AXV250T2G
The NCP170 CMOS LDO regulator introduced by onsemi is specially designed for portable battery-powered applications requiring an ultra-low quiescent current. The typical ultra-low power consumption is 500 nA, which can ensure long battery life. The dynamic transient boost function can improve the transient response of devices in wireless communication applications. The device is available in small 1 × 1 mm xDFN4, TSOP5, and SOT-563 packages.
The NCP170 has an ultralow quiescent current of 500 nA, a very low dropout of 170mV at 150mA, supports an adaptive ground current proportional to the load current, has a wide input voltage range of 2.2 V to 5.5 V, and has a factory trimmed high output voltage accuracy of ± 1%.
NCP170 has many advantages, i.e. Improved battery life, low power consumption at full load, fitness for battery-powered applications and space-constrained applications, and the ability to improve the performance of the end products. Its applications include long-life battery-powered applications, portable communication devices, Internet of Things sensor nodes, wearable devices, and "green" products with energy harvesting and ultra-low power consumption. The final products include NB-IOT modules, cameras, wireless sensor nodes, smoke detectors, smart watches, mobile phones, etc.
EEPROM finds a new stage with NFC/RF applications
Electrically erasable programmable read only memory (EEPROM) is a type of memory chip that retains its data when its power supply is switched off and can be erased and reprogrammed (rewritten to) repeatedly through the application of a higher than normal electrical voltage. EEPROM, a device with a long history, has found a new stage in the era of Internet of Things.
EEPROM with NFC/RF applications can store up to 64 kb of data, contains a unique ID, has a radio frequency range of about 1 meter (about 3 feet), can retrieve dates through two NFC/RF and I2C interfaces, and has 2,000,000 program/erase cycles, and 200 years of data retention. The traditional method requires the device to be taken off the assembly line for programming and connected to the power supply. The radio frequency method allows the device to stay on the assembly line during programming without using the power supply, thus saving time and money.
EEPROM with NFC/RF applications can do a lot in the application field of the Internet of Things. For example, when used for asset tracking, the final product can be programmed online (unpowered) on the mobile assembly line through NFC/RF in the supply chain, and security and inventory tracking management can be carried out as smart tags. When used for smart industrial applications, installed units can be wirelessly reprogrammed to strengthen debugging capability, as well as diagnostic data retrieval and tampering event tracking in metering applications. When applied to medical wearable devices, it can be used for data tracking and battery-free downloading of diagnostic data in telemedicine. When applied to smart home, it can be connected to a home WiFi network through mobile applications, and then read UID serial numbers (unpowered) from an EEPROM for electronic warranty registration, which can be used for keyless entry, log retrieval, and firmware updates (unpowered) in secure applications.
N24RF64 is a RFID tag with a 64 Kb EEPROM device
The N24RF64 is an RFID/NFC tag with a 64 Kb EEPROM device, offering both contactless and contact interface. In addition to the ISO/IEC 15693 radio frequency identification (RFID) interface protocol, the device features an I2C interface to communicate with the microcontroller. The I2C contact interface requires an external power supply. The 64 Kb EEPROM array is internally organized as 2048 x 32 bits in RF mode and as 8192 x 8 bits when accessed from the I2C interface.
N24RF64DTPT3G
The N24RF64 supports contactless data transmission, is ISO 15693/ISO 18000-3 model compliant, vicinity range communication (up to 150 cm), air interface communication at 13.56 MHz (HF). To tag: ASK modulation with 1.65 Kbit/s or 26.48 Kbit/s data rate, from tag: load modulation using Manchester coding with 423 kHz and 484 kHz subcarriers in low (6.6 Kbit/s) or high (26 Kbit/s) data rate mode. It supports the 53 Kbit/s data rate with fast commands, with read & write 32−bit block mode and anti−collision support, offering 64−bit unique identifier (UID), multiple 32−bit passwords and lock feature for each user memory sector. The N24RF64 can be applied to NFC tags, RF tags, and EEPROM.
Conclusion
Support of battery operation and low power consumption are required in smart home and Internet of Things applications. onsemi’s LDO regulator can meet these requirements. In NFC/RF tag applications, onsemi's EEPROM can be used as NFC/RFID tags to offer multiple contactless and contact interfaces. These products are the best partners for smart home and Internet of Things applications.
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