参数资料
型号: KIT13892VLEVBEJ
厂商: Freescale Semiconductor
文件页数: 64/158页
文件大小: 0K
描述: KIT EVAL FOR MC13892
标准包装: 1
主要目的: 电源管理和用户界面
嵌入式:
已用 IC / 零件: MC13892
主要属性: 10 位 ADC,4 输出降压转换器,12 LDO
次要属性: 与 i.MX51、i.MX37、i.MX35、i.MX27 一起使用
已供物品: 板,线缆,文档
FUNCTIONAL DEVICE OPERATION
OPERATING MODES
POWER MONITORING
The voltage at BPSNS and BP is monitored by detectors as summarized in Table 28 .
Table 28. BP Detection Thresholds
Threshold in V
Bit setting
Falling Edge
Rising Edge
BPSNS1
0
0
1
1
BPSNS0
0
1
0
1
UVDET
2.55
2.55
2.55
2.55
LOBATL
2.8
2.9
3.0
3.1
LOBATH
3.0
3.1
3.3
3.4
BPON
3.2
3.2
3.2
3.2
Notes
57. Default setting for BPSNS[1:0] is 00. The above specified thresholds are ±50 mV accurate for the indicated edge. A hysteresis is applied
to the detectors on the order of 100 mV. BPON is monitoring BP. UVDET, LOBATL and LOBATH are monitoring BPSNS and thresholds
are correlated.
The UVDET and BPON thresholds are related to the power on/off events as described earlier in this chapter. The LOBATH
threshold is used as a weak battery warning. An interrupt LOBATHI is generated when crossing the threshold (dual edge). The
LOBATL threshold is used as a low battery detect. An interrupt LOBATLI is generated when dropping below the threshold. The
sense bits are coded in line with previous generation parts.
Table 29. Power Monitoring Summary
BPSNS
< LOBATL
LOBATL-LOBATH
LOBATH-BPON
>BPON
BPONS
0
0
0
1
LOBATHS
0
0
1
1
LOBATLS
1
0
0
0
POWER SAVING
SYSTEM STANDBY
A product may be designed to go into DSM after periods of inactivity, such as if a music player completes a play list and no
further activity is detected, or if a gaming interface sits idle for an extended period. Two Standby pins are provided for board level
control of timing in and out of such deep sleep modes.
When a product is in DSM it may be able to reduce the overall platform current by lowering the switcher output voltage,
disabling some regulators, or forcing some GPO low. This can be obtained by SPI configuration of the Standby response of the
circuits along with control of the Standby pins.
To ensure that shared resources are properly powered when required, the system will only be allowed into Standby when both
the STANDBY and the STANDBYSEC are activated. The states of the Standby pins only have influence in On mode. A command
to transition to one of the Low-power Off states (User Off or Memory Hold, initiated with USEROFFSPI = 1) has priority over
Standby.
Note that the Standby pins are programmable for Active High or Active Low polarity, and that decoding of a Standby event will
take into account the programmed input polarities associated with each pin.
Table 30. Standby Pin and Polarity Control
STANDBY (Pin)
0
x
1
x
0
STANDBYINV (SPI bit)
0
x
1
x
1
STANDBYSEC (Pin)
x
0
x
1
0
STANDBYSECINV (SPI bit)
x
0
x
1
1
STANDBY Control (58)
0
0
0
0
1
MC13892
Analog Integrated Circuit Device Data
64
Freescale Semiconductor
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