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Mixing SMBus & I 2 C SMBus 2.0 high-power I 2 C specifications are not directly compatible: I 2 C (Vdd-based) SMBus VIL MAX 0.89V (=0.9 Vdd min) 0.80V VIH MIN 2.54V (= 0.7 Vdd max) 2.1V VOL, MAX 0.4V at 3mA 0.4V at 4mA THD; DAT 0 ns 300 nS Intel Developer Forum Spring 2001 RISE TIME 1000 ns from 0.89V to 2.54V 1000 ns from 0.65V to 2.25V FALL TIME* output stage: 250 ns from 2.54V to 0.89V bus: 300 ns 300 ns from 2.25V to 0.65V * I 2 C specifies a faster fall on the output stage in order to allow for the possible inclusion of external series ESD protection resistors SMBus I 2 C Copyright © 2001 Intel Corporation. Page 54
Mixing SMBus & I 2 C - design for interoperability Controllers & Sensor Devices Intel Developer Forum Spring 2001 • Design devices to sink 4mA, min. • Design devices to output I 2 C ‘1’ and SMBus ‘0’ levels. • Design devices to accept SMBus ‘1’ and I 2 C ‘0’ levels. • Output data with SMBus hold time [THD;DAT = 300 ns] • Accept data with I 2 C hold time [THD;DAT = 0 ns] • Recommended that new fixed-address sensor devices be discoverable per the SMBus 2.0 specification Support ‘Dual Protocol’ in new Management Controllers and Sensor Devices Copyright © 2001 Intel Corporation. Page 55
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Server Management Controllers, Sens
Page 3 and 4: Disclaimers • A good starting poi
Page 5 and 6: IPMI Intelligent Platform Managemen
Page 7 and 8: Initiative News Intel Developer For
Page 9 and 10: Future: PCI Management Bus Intel De
Page 11 and 12: PCI Management Bus Server/IPMI appl
Page 13 and 14: BMC Features to look for… Built-i
Page 15 and 16: BMC Features to look for… I 2 C/S
Page 17 and 18: BMC Features to look for… Process
Page 19 and 20: BMC Features to look for… UARTs a
Page 21 and 22: BMC Features to look for... FAN mon
Page 23 and 24: BMC Features to look for… Extensi
Page 25 and 26: BMC Features to look for... Low Bea
Page 27 and 28: Management Controllers* Mfr. produc
Page 29 and 30: Enclosure/Peripheral Controllers Ex
Page 31 and 32: Enclosure Controllers Vitesse Semic
Page 33 and 34: Enclosure Controllers Qlogic GEM359
Page 35 and 36: Enclosure/Peripheral Controllers* I
Page 37 and 38: Temperature Monitoring and Fan Cont
Page 39 and 40: Board Temperature Sensors* Intel De
Page 41 and 42: Hardware Monitors* Analog Devices C
Page 43 and 44: Miscellaneous Sensors and Actuators
Page 45 and 46: Remote Management Cards Extend mana
Page 47 and 48: I 2 C/SMBus Application Multiplexin
Page 49 and 50: CBT 3244 PCF 8574 I 2 C/SMBus Appli
Page 51 and 52: I 2 C/SMBus Application Conversion
Page 53: I 2 C/SMBus Application Multiplexin
Page 57 and 58: SMBus & I 2 C Design Recommendation
Page 59 and 60: SMBus & I 2 C Design Recommendation
Page 61 and 62: I 2 C/SMBus Testing Noise Tolerance
Page 63 and 64: I 2 C/SMBus Testing Testers & Monit
Page 65 and 66: IPMI Conformance Test Intel Develop
Page 67 and 68: Resource Information Component & To
Page 69 and 70: Call to Action Intel Developer Foru
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