DEMO MANUAL DC1605B Programmable Hex Voltage Supervisor Featuring the LTC2936 with EEPROM Description The DC1605B is a demonstration system that showcases the LTC2936 quickly and without the need for external 2 the LTC 2936, a 6-channel I C/SMBus voltage supervisor voltmeters or power supplies. with EEPROM. The LTC2936 simultaneously monitors up The DC1605B demo board can be powered by an external to six power supply voltages and detects undervoltage and power supply, such as a 12VDC supply. Communication overvoltage conditions. In addition the LTC2936 monitors with the software is provided through the DC1613 USB-to- two GPI pins and is able to drive three GPIO pins to indicate 2 I C/SMBus/PMBus Controller. The following is a checklist OV, UV, system reset, system alert, or other control signal. of items which can be obtained from the LTC website or The DC1605B is a single circuit board that contains the LTC Field Sales. LTC2936 and support circuitry to provide the ability to dem- 2 n USB-to-I C/SMBus/PMBus Controller (DC1613) onstrate features and capabilities of the LTC2936 without n LTpowerPlay Software the need for external power supplies. The DC1605B demo board provides an accurate voltage supervision of six chan- DC1605B Features nels and offers over/undervoltage thresholds in various ranges and increments that are digitally programmable. n Supervise Six Power Supplies This demonstration system is supported by the n Powered from USB Dongle, Power Jack, or V IN LTpowerPlay graphical user interface (GUI) which en- 2 n I C Adjustable OV/UV Trip Points ables complete control of all the features of the device. n Together, the LTpowerPlay software and DC1605B hard- Guaranteed Threshold Accuracy: 1% ware system create a powerful development environment 2 n I C/SMBus Serial Interface for designing and testing configuration settings of the n Internal EEPROM LTC2936. These settings can be stored in the devices internal EEPROM or in a file. This file can later be used n Six Comparator Outputs to order pre-programmed devices or to program devices n 256 Programmable Thresholds per Channel in a production environment. The software displays all of the configuration settings and real time measurements n Up to Three Range Settings per Channel from the system supervisor and peripheral ICs. Telemetry n Two General Purpose Inputs allows easy access and decoding of the fault log created n by the LTC2936. The board comes pre-programmed with Three General Purpose Inputs/Outputs the EEPROM values appropriate for the six power supply n Programmable Output Delays rails on the DC1605B. Just plug and play n Autonomous Operation without Additional Software The LTC2936 chip is mounted on the topside of the board n Supported by LTpowerPlay GUI with support ADC and DAC circuitry on the back. n LTC2936 Available in 24-Lead QFN and SSOP Packages The ADC provides voltage readings for all six voltage supervisor inputs on the LTC2936 and also reads the GPI Design files for this circuit board are available at and GPIO voltages. The DAC drives six programmable DEMO MANUAL DC1605B performance s ummary Specifications are valid over the full operating temperature range. Common Characteristics PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Input Voltage Range V 3.4 13.9 V PWR V = V 3.2 3.4 V PWR DD33 V1 to V6 Threshold Accuracy 1.0 % V1 to V6 Monitoring Range Precision Range 0.2 1.2 V Low Range 0.5 3.0 V Medium Range 1.0 5.8 V Table 1. Default Thresholds and GPIO Mappings Vn THR LO Vn THR HI GPIO1 GPIO2 GPIO3 CMP Default Thresholds OV ALERT UV V1 3.2 3.4 Comp Hi Comp Hi Comp Lo Comp Lo V2 2.4V 2.6V Comp Hi Comp Hi Comp Lo Comp Lo V3 1.7V 1.9V Comp Hi Comp Hi Comp Lo Comp Lo V4 1.4V 1.6V Comp Hi Comp Hi Comp Lo Comp Lo V5 1.1V 1.3V Comp Hi Comp Hi Comp Lo Comp Lo V6 0.95V 1.05V Comp Hi Comp Hi Comp Lo Comp Lo Table 2. Default GPI Settings MANUAL RESET MARGIN UVDISABLE AUX COMP GPI1 GPI2 Glossary of t erms The following list contains terms used throughout the MR Manual Reset, Active Low. A GPI pin may be pro- document. grammed to this function and map behavior to a GPIO pin, and optionally clear the fault history. Nominal V = 1.0V. TH AUXC Auxiliary Comparator. A GPI pin may be pro- grammed to this function and map behavior to a GPIO NVM Non-volatile memory, see EEPROM. pin. Nominal V = 0.5V. TH OV Overvoltage, the result of a voltage comparison that EEPROM Non-volatile memory (NVM) storage used to a pin voltage is above a programmable threshold voltage. retain data after power is removed. Rail The final output voltage that the LTC2936 supervises. Margin Term used typically in board level testing that Supervise The act of quickly responding (compared to increases/decreases the output voltage to look for sensi- a fault setting) to a voltage condition that is compared to tivity/marginality problems. pre-programmed values. MARG Ignore margining (OV and UV) when active (low). UV Undervoltage, the result of a voltage comparison that A GPI pin may be programmed to this function and map a pin voltage is below a programmable threshold voltage. behavior to a GPIO pin. Nominal V = 1.0V. TH UVDIS UV Disable. Ignore UVs when the pin is low. A GPI pin may be programmed to this function and map behavior to a GPIO pin. Nominal V = 1.0V. TH dc1605bf 2