ZBA Inc. BT44-291S ユーザーズマニュアル
BT44-291S
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11.2
Status after Reset
The chip status after a reset is as follows:
z Warm Reset: Baud rate and RAM data remain available
z Cold Reset(1): Baud rate and RAM data not available
z Cold Reset(1): Baud rate and RAM data not available
Note:
(1) Cold Reset constitutes one of the following:
(1) Cold Reset constitutes one of the following:
z Power cycle
z System reset (firmware fault code)
z Reset signal, see Section “RESETB”
z System reset (firmware fault code)
z Reset signal, see Section “RESETB”
12. Solder Profiles
Composition of the solder ball: Sn 95.5%, Ag 4.0%, Cu 0.5%
Typical Lead-Free Re-flow Solder Profile
Key features of the profile:
z Initial Ramp = 1-2.5°C/sec to 175°C±25°C equilibrium
z Equilibrium time = 60 to 180 seconds
z Ramp to Maximum temperature (250°C) = 3°C/sec max.
z Time above liquidus temperature (217°C): 45-90 seconds
z Device absolute maximum reflow temperature: 260°C
z Equilibrium time = 60 to 180 seconds
z Ramp to Maximum temperature (250°C) = 3°C/sec max.
z Time above liquidus temperature (217°C): 45-90 seconds
z Device absolute maximum reflow temperature: 260°C
Devices will withstand the specified profile. Lead-free devices will withstand up to three reflows
to a maximum temperature of 260°C.
to a maximum temperature of 260°C.
Notes:They need to be baked prior to mounting。