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CY8C4128FNI-BL473 Fiches technique(PDF) 41 Page - Cypress Semiconductor |
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CY8C4128FNI-BL473 Fiches technique(HTML) 41 Page - Cypress Semiconductor |
41 / 47 page PRELIMINARY PSoC® 4: PSoC 4XX8_BLE Family Datasheet Document Number: 001-94624 Rev. *K Page 41 of 47 WLCSP Compatibility The PSoC 4XXX_BLE family has products with 128 KB (16KB SRAM) and 256 KB (32KB SRAM) Flash. Package pin-outs and sizes are identical for the 56-pin QFN package but are different in one dimension for the 68-ball WLCSP. The 256KB Flash product has an extra column of balls which are required for mechanical integrity purposes in the Chip-Scale package. With consideration for this difference, the land pattern on the PCB may be designed such that either product may be used with no change to the PCB design. Figure 9 shows the 128KB and 256 KB Flash CSP packages. Figure 9. 128KB and 256 KB Flash CSP Packages The rightmost column of (all NC, No Connect) balls in the 256K BLE WLCSP is for mechanical integrity purposes. The package is thus wider (3.2 mm versus 2.8 mm). All other dimensions are identical. Cypress will provide layout symbols for PCB layout. The scheme in Figure 9 is implemented to design the PCB for the 256K BLE package with the appropriate space requirements thus allowing use of either package at a later time without redesigning the Printed Circuit Board. 128K BLE 256K BLE CONNECTED PADS NC PADS PACKAGE CENTER PACK BOUNDARY FIDUCIAL FOR128K FIDUCIAL FOR256K |
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