參數(shù)資料
型號(hào)： TPS65950ZXNR
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝： 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁(yè)數(shù)： 129/167頁(yè)
文件大?。?/td> 2566K
代理商： TPS65950ZXNR
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5
Real-Time Clock and Embedded Power Controller
5.1
RTC
5.1.1
Backup Battery
5.2
EPC
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
The TPS65930 and TPS65920 devices contain an RTC to provide clock and timekeeping functions and an
EPC to provide battery supervision and control.
The RTC provides the following basic functions:
Time information (seconds/minutes/hours) directly in binary-coded decimal (BCD) code
Calendar information (day/month/year/day of the week) directly in BCD code
Interrupt generation periodically (1 second/1 minute/1 hour/1 day) or at a precise time (alarm function)
32-kHz oscillator drift compensation and time correction
Alarm-triggered system wake-up event
The TPS65030 and TPS65920 implement a backup mode in which a backup battery can keep the RTC
running to maintain clock and time information even if the main supply is not present. If the backup battery
is rechargeable, the device also provides a backup battery charger so it can be recharged when the main
battery supply is present.
The backup domain powers the following:
Internal 32.768-kHz crystal oscillator
RTC
Eight general-purpose (GP) storage registers
Backup domain low-power regulator (VBRTC)
The EPC provides five system states for optimal power use by the system, as listed in Table 5-1.
Table 5-1. System States
System State
Description
NO SUPPLY
The system is not powered by any battery.
BACKUP
The system is powered only with the backup battery and maintains
only the VBRTC supply.
WAIT-ON
The system is powered by the main battery and maintains only the
VRRTC supply. It can accept switch-on requests.
ACTIVE
The system is powered by the main battery; all supplies can be
enabled with full current capability.
SLEEP
The main battery powers the system; selected supplies are enabled,
but in low consumption mode.
Three categories of events can trigger state transitions:
Hardware events: Supply/battery insertion, wake-up requests, USB plug, and RTC alarm
Software events: Switch-off commands, switch-on commands, and sleep-on commands
Monitoring events: Supply/battery level check, main battery removal, main battery fail, and thermal
shutdown
Real-Time Clock and Embedded Power Controller
64
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