IMX28CEC datasheet(60/70 Pages) FREESCALE

60 / 70 page

i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

Package Information and Contact Assignments

4.1

289-Ball MAPBGA—Case 14 x 14 mm, 0.8 mm Pitch

The following notes apply to Figure 44:

•

All dimensions are in millimeters.

•

Dimensioning and tolerancing per ASME Y14.5M-1994.

•

Maximum solder bump diameter measured parallel to datum A.

•

Datum A, the seating plane, is determined by the spherical crowns of the solder bumps.

•

Parallelism measurement excludes any effect of mark on top surface of package.

Table 64. UART Receive Timing Parameters

Parameter

Symbol

Min.

Max.

Units

UA2

Receive bit time1

1 The UART receiver can tolerate 1/(16

× F

baud_rate) tolerance in each bit. But accumulation tolerance in one frame must not

exceed 3/(16

× F

baud_rate).

tRbit

1/Fbaud_rate

2 – 1/(16

× F

baud_rate)

2 F

baud_rate: Baud rate frequency. The maximum baud rate the UARTAPP can support is 3.25 Mbps. The maximum baud rate of

DebugUART is 115 kbps.

1/Fbaud_rate + 1/(16

× F

baud_rate)

—

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