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M41ST85W 数据表(PDF) 7 Page - STMicroelectronics |
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M41ST85W 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 43 page ![]() DocID7531 Rev 12 7/43 M41ST85W Description 43 The M41ST85W is offered in two 28-lead SOIC packages. The 300 mil SOH28 SNAPHAT® IC package mates with ST’s SNAPHAT battery/crystal top (ordered separately). SNAPHAT battery options include 48 mAh and 120 mAh. ST’s 300 mil SOX28 embedded crystal IC includes the 32 KHz crystal and is perfect for applications where a low profile is a must. The SOH28 SNAPHAT SOIC includes sockets with gold plated contacts at both ends for direct connection to the SNAPHAT top. The SNAPHAT battery/crystal top is inserted atop the IC package after the completion of the surface mount assembly process which avoids potential battery and crystal damage due to the high temperatures required for device surface-mounting. The unique design allows the battery to be replaced, thus extending the life of the RTC and NVRAM indefinitely. The SNAPHAT top is keyed to prevent reverse insertion. The SNAPHAT IC and SNAPHAT tops are shipped separately. The ICs are available in plastic anti-static tubes or in tape & reel form. The SNAPHAT tops are shipped in plastic anti-static tubes. The part numbers are M4T28-BR12SH1 (48 mAh) and M4T32-BR12SH1 (120 mAh). For the extended temperature requirement, the 120 mAh M4T32-BR12SH6 is available. For more information, see Table on page 40. Caution: Do not place the SNAPHAT® battery/crystal top in conductive foam, as this will drain the lithium button-cell battery. The 300 mil SOX embedded crystal SOIC typically requires a user-supplied battery for non- volatile operation. Capacitor backup can also be implemented with this package. Figure 1. Logic diagram 1. For 28-pin, 300 mil embedded crystal SOIC only. AI03658 SCL VCC M41ST85W EX VSS VBAT (1) SDA RSTIN1 IRQ/FT/OUT SQW WDI RSTIN2 PFI ECON RST PFO VOUT |
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