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UCD3138RHAT Folha de dados(PDF) 55 Page - Texas Instruments |
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UCD3138RHAT Folha de dados(HTML) 55 Page - Texas Instruments |
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55 / 68 page  EXT CAP AD02 R1 Digital R 0 I const ADC12 & CMP ADC12 & CMP ESD ESD ESD RES R2 ESD AD13 3.3 V 3.3 V q2 q1 3.3 V UCD3138 www.ti.com SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012 4.21.1 JTAG Use for I/O and JTAG Security The UCD3138 provides a JTAG interface for debugging and for uploading data and programs. The pins are multiplexed with other pins, and will not be available in certain topologies. For power supplies, other debugging techniques (PMBus, UART, code instrumentation) are often superior to JTAG. Code downloading is much faster via PMBus, or with a user boot program via UART. PMBus support is available from TI. JTAG for debugging has limited support from TI’s Code Composer Studio. JTAG parameter download may be supported by third parties. 4.22 Current Sharing Control UCD3138 provides three separate modes of current sharing operation. • Analog bus current sharing • PWM bus current sharing • Master/Slave current sharing The simplified current sharing circuitry is shown in the drawing below: FOR TEST ONLY, CURRENT SHARING MODE CS_MODE EN_SW1 EN_SW2 DPWM ALWAYS KEEP 00 Off or Slave Mode (3-state) 00 00 (default) 0 0 0 PWM Bus 00 01 1 0 ACTIVE Off or Slave Mode (3-state) 00 10 0 0 0 Analog Bus or Master 00 11 0 1 0 The period and the duty of 8-bit PWM current source and the state of the SW1 and SW2 switches can be controlled through the current sharing control register (CSCTRL). 4.23 Temperature Reference The temperature reference register (TEMPREF) provides the ADC12 count when ADC12 measures the internal temperature sensor (channel 14) during the factory trim and calibration. This information can be used by different periodic temperature compensation routines implemented in the firmware. But it should not be overwritten by firmware, otherwise this factory written value will be lost. Copyright © 2012, Texas Instruments Incorporated Functional Overview 55 Submit Documentation Feedback Product Folder Link(s): UCD3138 |
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