LPC2926_27_29 NXP Semiconductors, LPC2926_27_29 Datasheet - Page 88
LPC2926_27_29
Manufacturer Part Number
LPC2926_27_29
Description
The LPC2926/2927/2929 combine an ARM968E-S CPU core with two integrated TCMblocks operating at frequencies of up to 125 MHz, Full-speed USB 2
Manufacturer
NXP Semiconductors
Datasheet
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LPC2926_27_29
Product data sheet
12.4 Reflow soldering
Key characteristics in reflow soldering are:
Table 44.
Table 45.
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see
Package thickness (mm)
< 2.5
≥ 2.5
Package thickness (mm)
< 1.6
1.6 to 2.5
> 2.5
•
•
•
Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see
reducing the process window
Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 44
SnPb eutectic process (from J-STD-020C)
Lead-free process (from J-STD-020C)
and
Figure
All information provided in this document is subject to legal disclaimers.
45
Rev. 5 — 28 September 2010
40.
Package reflow temperature (°C)
Volume (mm
< 350
235
220
Package reflow temperature (°C)
Volume (mm
< 350
260
260
250
3
3
ARM9 microcontroller with CAN, LIN, and USB
)
)
Figure
LPC2926/2927/2929
350 to 2000
260
250
245
40) than a SnPb process, thus
≥ 350
220
220
245
> 2000
260
245
© NXP B.V. 2010. All rights reserved.
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