The system energy manager is a highly integrated microcontroller that provides several key features for systems including key scanning and control, battery and power management, as well as two 2-Wire serial I/O Ports. It incorporates the Dallas 8051-compatible high-speed microcontroller core which has been redesigned to eliminate wasted clock and memory cycles. Every standard 8051 instruction is executed between 1.5 and 3 times faster than the original for the same crystal speed. Looking at it another way, the high-speed core achieves the same throughput as a standard 8051 while using much less power as a result of fewer required clock cycles. As a result, the firmware can easily support many tasks required by mobile systems within a single component.

The controller is designed to off-load battery and power management tasks from the host CPU and thereby make possible an efficient solution for systems. In addition to the microcontroller core, it incorporates an 8-channel, 10-bit A/D converter with external reference so that its firmware can perform battery management tasks without burdening the host CPU. A four-channel 8-bit pulse-width modulator allows digital control of functions such as LCD contrast and brightness. An 8-bit port is provided for key scan inputs. A total of 88 parallel I/O pins are available for key scanning, system configuration, and power management control.

The system energy manager scans a key matrix and interfaces to the host CPU via an 8042-compatible port. The benefits of sophisticated power management and permanently powered functions are thereby attained without adding to the system's chip count.

Two 2-wire, bi-directional serial buses are incorporated to facilitate the management of slave peripheral devices on the motherboard, such as digital temperature sensors and potentiometers, and to support external low-speed I/O devices such as monitor configuration channels, pen tablets, and joysticks.

Because a direct interface to the X-bus is provided, the controller is not dependent on a particular core logic chip or chip set. Independent chip select inputs for the keyboard controller, power management #1, and power management #2 registers are provided.

• MAX1184 - 双路、10位、20Msps、+3V、低功耗ADC，内置电压基准及并行输出
• MX7548 - CMOS、8位总线兼容、12位DAC
• MAX5411 - 双路、音量调节、对数数字电位器
• MAX8892 - 高PSRR、低压差、150mA线性稳压器
• MAX6384 - SC70/µDFN封装、单/双路、低电压、低功耗、微处理器复位电路
• MAX4403 - 单/双/四路、低成本、单电源、满摆幅运算放大器，带有关断
• MAX5907 - 低电压、双路、热插拔控制器/供电排序器
• MAX4020 - 低成本、高速、单电源运算放大器，满摆幅输出
• MAX1662 - 串-并/并-串转换器及负载开关控制器，带有SMBus接口
• ZA9L0 - DeepCover安全微控制器，具有ARM922T处理器内核