Advertisement

Article

Mixed signal power control is programmable and non volatile

Lattice Semiconductor Corporation announced the extension of its revolutionary ispPAC Power Manager programmable mixed-signal product family with the production release of the Precision Power Manager ” Power1208P1 device. The Power1208P1 device, like its predecessor the Power1208, provides a complete solution for printed circuit board (PCB) power sequencing and management through an optimized set of programmable digital and analog functions.

The Power1208P1 also extends the power and versatility of the Lattice Power Manager products: the analog inputs are capable of monitoring power supplies with voltages down to 0.67V, and are able to detect faults with greater than 0.5% precision. In addition, the Precision Power Manager can detect a power-off condition (i.e., power supply voltage less than 80 mV). The Power1208P1 is pin compatible with the existing Power1208, and is available in a compact 44-pin Thin Quad Flat Pack (TQFP) package.

Increasing Emphasis on Precise Fault Detection

The complexity of power supply management has increased dramatically in recent years as the number of voltages ound on the typical PCB has risen sharply. The use of core power supply voltages less than the standard 1.2V is becoming more common. Further, advanced integrated circuit tolerance of power supply voltage variation is also tightening. The ability of the Power1208P1 to simultaneously monitor all 12 power supply inputs provides rapid, accurate power supply fault detection, reducing fault propagation and consequently improving overall system reliability.

“Managing today's power supply voltages with greater precision can only be achieved by using mixed-signal devices with higher accuracy,” said Stan Kopec, Lattice vice president of corporate marketing. “With the addition of the Power1208P1 device, designers can now employ our standardized power management approach that includes PCBs that use power supplies of 1.2V or less.”

About the Power1208P1

The Power1208P1 features 12 high precision analog power monitor inputs. Each analog input has programmable threshold (384 steps + power supply discharge detection) synchronous comparators with a fault detection precision of 0.5%. In addition, the 1208P1 device is equipped with on-chip programmable voltage references for supply monitoring, 4 noise-immune digital inputs and 4 open-drain digital outputs for system control interfacing, 4 programmable timers with an on-chip 1 MHz oscillator for delay control and a 16 macrocell Complex PLD (CPLD) to implement sequencing and control functions. The Power1208P1 is ruggedized to operate reliably in noisy power supply environments from 2.7V to 5.5V.

Lattice Power Manager devices provide a standard, off-the-shelf programmable mixed-signal solution for power management that enhances reliability and speeds time-to-market. Analog features such as input comparator thresholds and digital functions such as supply control sequences are programmed into non-volatile E2CMOS elements on the devices using an IEEE1149.1 boundary scan protocol.

Applications for Power Manager devices include telecom and networking systems, storage systems, servers, test equipment and automotive electronics. Programmable features make Power Manager devices ideal for controlling multiple power supplies in conjunction with a wide range of regulator and switching technologies. Together with N-channel switching FETs, LDO (Low Drop Out) regulators, and/or DC-DC convertors (power bricks), the Power1208P1, Power1208 and Power604 devices provide compact, flexible power supply control solutions.

PAC-Designer Version 3.3 Supports Enhanced Instruction Set LogiBuilder

The Precision Power Manager device is supported by the latest version PAC-Designer software, an intuitive schematic design entry and simulation tool. Complex sequencing and monitoring functionality can be efficiently designed through easy-to-use pull-down menus in PAC-Designer's LogiBuilder module. The latest version of the tool features a new and improved instruction set that enables the user to implement complex functionality more efficiently. Designs can be completely verified using the tool's built-in waveform simulator. The PAC-Designer software is available for download from Lattice at www.latticesemi.com.

The PACsysPOWR1208P1 evaluation kit enables designers to quickly build prototypes of their circuit implementations using the Power1208P1 in order to verify functionality. Designs implemented using the PAC-Designer software are downloaded into the device through a serial ispDOWNLOAD cable that connects to a PC's parallel port. The kit contains an evaluation board for an ispPAC Power Manager device, an ispDOWNLOAD cable, and the PAC-Designer version 3.3 software.

Pricing and Availability

Prices for the Power1208P1 device begin at $9.95 in 10,000 piece quantities. The device in a 44-pin TQFP package (industrial temperature grade, -40 C to +85 C) is available now.

PACsysPOWR1208P1 evaluation kits are also available through authorized Lattice distributors or on the Lattice web site at a price of $149.

While the voltages and current ratings of our power supplies may change as new logic families become predominant, the need still exists to use more than one power supply in most designs. They may be needed just for reference level in communication links like NRZ. They may be needed for mixed signal supplies for dual rail instrumentation or audio for example.

The need also arises for the same power supply voltages to be sequenced and fault monitored. Plug in interfaces for example need to be able detect, sequence, and monitor for faults or out of tolerance conditions. Look at USB, power over Ethernet, Flash card interfaces, or hot swap boards and you will see that power sequencing, control, and monitoring is more than just a luxury.

I've long thought that programmable logic could be a good marriage to both digital and analog functions if done cleverly. I'm happy to see Lattice pushing this approach forward with the additions to its Power Manager programmable mixed-signal product family.

The newest member is the Power1208P1 device which is pin compatible with its predecessor (Power1208), but with extended versatility. The analog inputs are capable of monitoring power supplies with voltages down to 0.67V, and are able to detect faults with greater than 0.5% precision. Power off conditions where the supply is 80 mv or less can also be detected and used.

I like how each of the 12 high precision analog power monitor inputs has a 384 step programmable threshold. This can detect minor fluctuation in power supplies possibly indicating a fault which has not happened yet (failure is imminent).

Twelve may seem like a lot of monitor inputs, but, each level can have alert high and low condition threshold levels as well as emergency shutdown levels if needed. This is doable since the comparators have precision's of 0.5%. I like the addition of on-chip programmable voltage references. These can be used for error or compensation feedback. The 4 noise-immune digital inputs and 4 open-drain digital outputs help interface directly to the real world in a noisy environment.

On chip, the digital functionality is pretty neat too. There is an on chip 1 Mhz timer which can feed the 4 programmable timers. This is perfect for delays or asynchronous timing sequence steps. A 16 macrocell Complex PLD (CPLD) is also on chip to handle Mealy or Moore type state machine sequencers.

I also like how strategic use of non volatile EEPROM memory keeps threshold settings and timing settings stored for next power up cycle. Once programmed via J-Tag (IEEE1149.1) boundary scan protocol, these parts power up ready to go.

The company's PAC-Designer software supports intuitive schematic design entry and simulation. There is also a PACsysPOWR1208P1 evaluation kit available through authorized Lattice distributors or on the Lattice web site at a price of $149.

Housed in a 44-pin Thin Quad Flat Pack (TQFP) package, the Power1208P1 runs on 2.7V to 5.5V. Industrial temperature grade parts (-40C to +85C) are available now. They are priced at $9.95 in 10,000 piece quantities.

0 comments on “Mixed signal power control is programmable and non volatile

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.