参数资料
型号: AS3658-BCTP
厂商: ams
文件页数: 135/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description - System Functions
10.5
Protection Functions
All LDO’s, the DCDC step ups and DCDC step downs have an integrated overcurrent protection. An overtemperature
protection of the chip is also integrated which can be switched on with the serial interface signal temp_pmc_on
(enabled by default; it is not recommended to disable the overtemperture protection). The chip has two signals for the
serial interface: ov_temp_110 and ov_temp_140. The flag ov_temp_110 is automatically reset if the overtemperature
condition is removed, whereas ov_temp_140 has to be reset by the serial interface with the signal rst_ov_temp_140.
If the flag ov_temp_140 is set, an automatic reset of the complete chip is initiated. The flag ov_temp_140 is not
affected by this reset cycle allowing the software to detect the reason for this unexpected shutdown.
Table 154. Overtemperature Detection
Symbol
T 110
T 140
Parameter
ov_temp_110 rising
threshold
ov_temp_140 rising
threshold
Min
95
125
Typ
110
140
Max
125
155
Unit
oC
oC
Note
ov_temp_110 and
T hyst
ov_temp_140
5
oC
hysteresis
Table 155. Overtermperature detection Bit definition
Addr:106
Overtemperature Control
These bits control the startup and are set by factory test
Bit
Bit Name
Default
Access
Description
Switch on / off of temperature supervision; default: on
0
temp_pmc_on
1
R/W
– all other bits are only valid if set to ‘1’
Leave at 1 , do not disable
1
ov_temp_110
NA
R
Flag that the overtemperature threshold 1 (T 110 ) has
been reached
Flag that the overtemperature threshold 2 (T 140 ) has
2
ov_temp_140
NA
R
been reached – this flag is not reset by a
overtemperature caused reset and has to be reset by
rst_ov_temp_140
If the overtemperature threshold 2 has been reached,
3
rst_ov_temp_140
0
W
the flag ov_temp_140 is set and a reset cycle is
started. ov_temp_140 should be reset by writing 1 and
afterward 0 to rst_ov_temp_140
10.5.1 Temperature Supervision
A temperature sensor is implemented to provide over-temperature protection of the chip. It generates two flags linked
to the two temperature thresholds (110 degrees, 140 degrees). Both thresholds have an hysteresis to prevent
oscillation effects.
First threshold (110 degrees) sets the flag ov_temp_110, signalling the serial interface part and software the 110
degrees overtemperature condition. If enabled (ovtmp_int_mask=0), an interrupt can be send (interrupt ‘ovtmp’). Thus
software can react and can shutdown power consuming functions to decrease temperature.
The second threshold (140 degrees) initiates a reset cycle and sets ov_temp_140: this sets all regulators into power-
down mode and stops charging, and performs the reset cycle of the AS3658.
rst_ov_temp_140 flag
In case of overtemperature and an activated reset (temp_pmc_on=1), the system loses any information about the error
which activated the reset state. Therefore, a flag is implemented, which indicates that the reset was caused by
overtemperature activation (ov_temp_140 is set). This flag is only resetable by writing ‘1’ to rst_ovtemp_140.
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