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TMS37157 Datasheet(PDF) 5 Page - Texas Instruments |
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TMS37157 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 47 page  TMS37157 www.ti.com SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009 VCL/VBAT CHECKER (continued) PARAMETER MIN NOM MAX UNIT Vcharge VBAT charge voltage 3.4 V Vch VCL checker threshold voltage 3.1 V TRIMMING CAPACITORS AND SWITCHES PARAMETER MIN NOM MAX UNIT Tstep Trimming steps 128 CTmin Minimum trimming capacitor 0 pF CT1 Trimming capacitor 1 0.6 pF CT2 Trimming capacitor 2 1.2 pF CT3 Trimming capacitor 3 2.4 pF CT4 Trimming capacitor 4 4.7 pF CT5 Trimming capacitor 5 9.4 pF CT6 Trimming capacitor 6 18.8 pF CT7 Trimming capacitor 7 37.6 pF CT Maximum trimming capacitor (CT = CT1+ CT2+ … + CT7) 63.5 74.4 85.9 pF RF LIMITER PARAMETER MIN NOM MAX UNIT VRFlim RF limiter voltage 10.5 12 14 V VCLlim Limited VCL voltage Limited VCL voltage is the result of the RF 5.75 5.9 6.5 V limiter in the application circuit CONTROL AND SPI INTERFACE PARAMETER MIN NOM MAX UNIT Busy low time See SPI Comm. 30-70 μs Busy high time See SPI Comm. 10-30 ms PARAMETER MIN NOM MAX UNIT VOL Low level output voltage, SPI_SOMI, VBAT = 2.0…3.6V, RL = 100 kΩ 0.05 × 0.07 × V BUSY VBAT VBAT VOH High level output voltage, VBAT = 2.0…3.6V, RL = 100 kΩ 0.93 × 0.95 × V SPI_SOMI, BUSY VBAT VBAT VIL Low level input voltage, SPI_SIMO, VBAT = 2.0…3.6V, RL = 100 kΩ 0.1 × V SPI_CLK VBAT VIH High level input voltage, SPI_SIMO, VBAT = 2.0…3.6V, RL = 100 kΩ 0.9 × VBAT V SPI_CLK VBAT ACTIVATION LIMIT OF TMS37157 PARAMETER MIN NOM MAX UNIT Vact Activation level for transponder f = 134.2 kHz(1) 5.75 5.9 6.5 V response (1) At beginning of the response the voltage VCL must be just limited. Only in this case the function is guaranteed if components and IC parameters are at the limit, see Figure 1 . The voltage is measured at VCL just before the Transponder starts with the response protocol. The longest in the application used downlink telegram with maximum number of high bits should be used. The low and high bit response frequency should be at the lowest value which occurs in the application. In case of an additional power phase (Programming) the level has to be after that additional power phase. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): TMS37157 |
Similar Part No. - TMS37157_11 |
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Similar Description - TMS37157_11 |
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