mỗi thiết bị Bluetooth có chứa một cơ sở dữ liệu dịch vụ có thể được truy vấn bởi các thiết bị khác. Các cơ sở dữ liệu dịch vụ truy cập thông qua các 0x0001 PSM L2CAP và các giao thức trao đổi thông tin với các cơ sở dữ liệu được gọi là giao thức phát hiện dịch vụ (SDP). | 102 Chapter 4 DC-DC Conversion Architectures board level design. The digitalization of power is progressing in each of these domains at different speeds which causes much confusion. Digital Power Chip Design In recent years a number of startups have tried to crack the computing market space at the chip level with digital implementations of the traditional analog PWM modulator design without much success. These implementations have found some space in high-end server blades applications that are low volume and tolerate higher cost. In handsets the increase in power levels is due to packing more elementary building blocks on-die. Such elementary building blocks have relatively low power consumption by themselves but in large numbers add up to a considerable amount of power. The most complex power management units PMUs built today clearly show that LDOs and switchers remain primarily analog. On top of traditional analog a good dose of digital is needed for communications and sequencing and is implemented with architectures ranging from state machines to microcontrollers. Digital Power IC Processes As far as integrated circuits are concerned the leading edge of the analog world long ago moved from pure analog to mixed analog and digital. Every VRM chip marries an on-die Digital to Analog Converter DAC to an analog switching regulator the same way every PMU mixes analog and digital blocks. The move to mixed signal the combination of analog and digital on the die is a revolution that began around 1980. It started tentatively within the bipolar world with Integrated Injection Logic I2L logic gates and then fully blossomed with bipolar CMOS and DMOS BCD monolithic processes. Today the leading monolithic power companies have BCD mixed signal processes. These companies as leaders often do position themselves as solution-oriented utilizing the most appropriate process components and techniques for the task at hand. BCD processes can use bipolar for precision CMOS for signal .
