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Summary of Contents for N2Power XL270 Series
- Page 1 PMBus Interface: User’s Guide XL270 Series 270-Watt AC to DC Power Supplies 706679 Rev 09-26-18...
- Page 2 This document and the PMBus™ firmware described within are subject to change without notice. PMBus is a trademark of System Management Interface Forum, Inc. The N2Power XL270 Series of power supplies optionally supports the industry standard PMBus. This document lists the commands that are currently supported in Version 1.2 of the XL270 PMBus implementation. Refer to the complete XL270 Product Specification (Document 706601) for details about the power supply’s operational...
- Page 3 NGINEERING EPARTMENT Pin numbers J3 Connector Figure 1 J3 Connector Tachometer Input, Auxiliary (Fan Controlled Output)/Standby Output Connector (J6) The J6 connector is a Molex Micro-Latch header (a.k.a. a jack) with 2mm pin spacing. The Molex part numbers for the mating housing and crimp-style snap-in terminals are listed in Table 2. There may be equivalent connector components available from other manufacturers.
- Page 4 NGINEERING EPARTMENT Signal Descriptions and Connector/Pin Assignments Signal Description/Remarks C Serial Clock Provides PMBus control/status interface. Pulled-up to 3.3V by a 4.7K resistor. Maximum frequency is 100Khz. C Serial Data Provides PMBus control/status interface. Pulled-up to 3.3V by a 4.7K resistor. Address 1 High-true address selection input (2 bits: 0, 1).
- Page 5 NGINEERING EPARTMENT Signal Name C Serial Clock J3-1 J3-2 C Serial Data J3-3 Address 1 Input (A1, see below) J3-4 Address 0 Input (A0, see below) J3-5 DC Return (ground) J3-6 DC Return (ground) J3-7 CAN High (CANH) (for Current Sharing) J3-8 CAN High (CANH) (for Current Sharing) J3-9...
- Page 6 NGINEERING EPARTMENT Addressing The XL270 supports one of four physical bus addresses. These are determined by selectively grounding the two high-true address input lines shown in Table 4. Leaving the address pins open will be treated as logic high. J3-3 (A1) J3-4 (A0) Address Open...
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Page 7: Supported Commands
NGINEERING EPARTMENT Supported Commands Notes: 1) When applicable, PMBus commands use the direct data format. 2) Packet Error Checking (PEC) is not supported. 3) General Call Address (0x00, Global Broadcast) is not supported. 4) All PMBus reads are a combined data format, where there is no stop condition (stop bit) between the write data portion (PMBus command) and the read data portion. - Page 8 NGINEERING EPARTMENT STATUS_WORD 0x79 Status Bit Byte Number Name Description BUSY Not supported. Output off has occurred. VOUT_OV Output overvoltage fault has occurred. IOUT_OC Output overcurrent fault has occurred. VIN_UV Not supported. TEMPERATURE Transformer temperature fault has occurred. PMBus communications fault. NONE OF THE Not supported.
- Page 9 NGINEERING EPARTMENT READ_IOUT 0x8C The A/D count is linear from zero to 125% of nominal output current resulting in a full scale count of 1023d. Rated output current occurs at a count of 818d. 100% of rated currents are equal to 270-watts divided by the above output voltages.
- Page 10 NGINEERING EPARTMENT MFR_SPECIFIC_02 0xD2 – Fan Tachometer Count, Read Word This command returns a word value (low byte first) of the fan tachometer pulse count per second. The user should know what the pulse per revolution specification is for the fan that is installed, in order to translate this value into an actual RPM value.