DS1236-10+

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PMIC - Supervisors play a significant role in modern computing and electrical engineering for power management and control. DS1236-10+ Supervisors, manufactured by Dallas Semiconductor, is a prolific example of such. In this article, we will explore the scope of application and working principles of the DS1236-10+ Supervisors.

DS1236-10+ Supervisors are non-volatile memory ICs, used in a variety of applications, including microprocessor power control. In most applications, they are used in conjunction with battery charging ICs to create a reliable power solution. Aside from their use in battery charging circuits, their other applications include data storage, program retention, soft reset, password protection, miscellaneous logic, and more.

The DS1236-10+ Supervisor has two main functions: first, they protect the system against power failures, and second, they Watchdog. They are capable of monitoring the power and can detect power drops as well as false starts. When a drop in power is detected, the IC automatically and immediately repowers the system using its emergency supply. This emergency supply consists of a capacitor that provides backup power for a short duration of time in moments of emergency. The second function, the so-called ‘Watchdog,’ allows the IC to detect and initiate system reset when the processor or other components fail to complete their task within specific time periods.

The DS1236-10+ Supervisor is programmed using the Serial Peripheral Interface (SPI) or using a 3-Wire Interface. For configurations using the SPI, the data is sent over four or five pins (depending on the user’s needs). For the 3-Wire Interface, a single-wire connection is used, to provide access to the IC’s registers and settings, and the tenth pin is used to transfer the data In the 3-Wire Interface, the slave device (DS1236-10+ Supervisor) is powered from the Clock and Data lines of the Master device. The format can be both Standard (3-wire) and Standard Plus (4-wire).

In addition, for the 3-Wire Interface, the following commands are used for programming the supervisor:

• Set/Clear Function (sets or clears a specific bit in the memory array).
• Read Status (reads the contents of the memory array).
• Write Threshold (writes the hardware register values).
• Erase/Program Memory (erases or programs the memory array).
• Check/Verify Memory (checks the contents of the memory array).
• Read Value (reads the value of the memory array).
• Reset (resets the entire memory array).

The DS1236-10+ Supervisor operates at temperatures from 0˚C to 70˚C, is RoHS compliant, and is available in a 16-pin TSSOP package.Chip features of the DS1236-10+ Supervisor include an on-chip 10-bit Analog-to-Digital Converter (ADC), a Sigma Delta Modulator (SDM) for voltage monitoring, and a power fail detector which provides fail flags when the system fails and enters the fail state.

In summary, DS1236-10+ Supervisors offer a simple yet powerful solution for a variety of power management tasks. They are particularly useful in situations where a reliable power supply is a requirement, such as battery charging circuits, data storage operations, program retention, soft reset and password protection, among others. They are easy to set up and program, and feature SPI or 3-Wire Interface operations. With their multiple advanced features and robust operation, DS1236-10+ Supervisors represent a reliable and advanced example of modern Supervisors.

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