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SMM764FCR1 Datasheet(PDF) 6 Page - Summit Microelectronics, Inc. |
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SMM764FCR1 Datasheet(HTML) 6 Page - Summit Microelectronics, Inc. |
6 / 33 page SMM764 Preliminary Information Summit Microelectronics, Inc 2098 1.1 6/29/2005 6 Pin Number Pin Type Pin Name Pin Description 13 I/O SEQ_LINK SEQ_LINK (Sequence-Link™) is an open drain bi-directional pin. This pin should be attached to other Sequence-Link devices, during linked operation. SEQ_LINK must be pulled high through an external pull-up resistor when multiple Sequence-Link devices are used. When the SMM764 is not used with another Sequence-Link device, SEQ_LINK should be tied directly to ground. 14 I/O VREF VREF (Voltage Reference) is a bi-directional analog pin. VREF is used for Active DC Output Control and margining. VREF can be programmed to output the internal 1.25V reference, or accept an external reference. VREF is also used as a reference for the ADC. 15 CAP FILT_CAP FILT_CAP (Filter Capacitor) is an external capacitor input used to filter VMX inputs. 16,17, 18,20, 21,22, 23,25 NC No Connect Leave open, do not connect. These pins must be left floating. 41,36, 31,26 IN VMX VMX (Voltage Monitor) pins are analog inputs. These pins are normally attached to the positive converter sense line, VMA through VMD. 42,37, 32,27 CAP CAPX External capacitor input used to filter the VMX inputs to the 10-bit ADC, CAPA through CAPD. This provides an RC filter where R = 25kΩ.. 43,38, 33,28 OUT PUPX PUPX (Power Up Permitted) pins are programmable active high/low open drain converter enable output, PUPA through PUPD. 44,39, 34,29 OUT TRIMX Output voltage used to control the output of DC/DC converters, TRIMA through TRIMD. 45,40, 35,30 CAP TRIM_CAPX TRIM_CAPX is an analog output pin used to control the output of DC/DC converters. If the ADOC/margining functionality is not used on a channel the associated TRIM_CAPX pin should be left floating. There are 4 TRIM_CAPX pins, TRIM_CAPA through TRIM_CAPD. 46 PWR VDD Power supply of the part 47 PWR 12VIN 12VIN (12 Volt Input) is a power supply input internally regulated to either 3.6V or 5.5V. 48 CAP VDD_CAP VDD_CAP ( VDD Capacitor) is an external capacitor input used to filter the internal supply. PIN DESCRIPTIONS (Cont.) |
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