MTK_on_line_FAQ_HW_Smart Phone_MT6589
1 [FAQ04579][Important]MT6589如何支持高压IO(2.8V/3.3V)?
MT6589是通过另1.8V powerBIAS
比如
AVDD33_USB_P0/P1透过AVDD18_USB_P0/P1
DVDD33_MC1/MC2透过DVDD18_MC12
DVDD28_BPI/BSI透过DVDD18_BSI
实现支持2.8V/3.3V IO的,且还须要设定Register Enable/Disable 1.8V or 2.8V IO!
2 [FAQ04765][PMU][MT6320]MT6589平台电池必须内置ntc电阻器
For Thermal!
如果不能侦测电池温度,会有安全隐患。
极端情况下是在阳光直射下充电! 车载导航的情况下容易碰到这种情况。
3 [FAQ05292][ADB]获取CPU/PMIC热传感器校准信息
adb shell cat
/proc/mtktscpu/mtktscpu_cal
/proc/mtktspmic/mtktspmic_cal
Had Check in ALPS.JB2.MP和ALPS.JB2.EVDO.MP for MT6589
以前的load还是需要用刚开机的UART log来分辨,是否有burning thermal calibration info。
4 [FAQ04710][Audio]ACCDET upgraded compare to75/77?
Plug out hook key drop call / Short press miss key,3 Pole Accessory current consumption
à Plug out 的误触key 行为/short Key 的反应时间
àFor 3 Pole 的耳机目前更改为会关掉ACCDET 做省电的动作
Compare to ACCDET of 75/77
调整了原本ACCDET 200ms polling的时间,主要考虑一般USER按短key有几率落在200ms 下的短KEY,之前KEY 只有接通挂断电话,基本不会有短按的需求,但Multi-KEY需要play music 以及一些其他的短按动作,所以需要修改polling時間,side-effect是会多耗电。
5 [FAQ04705][Audio]AFE 2.8V/1.8V/1.2V supply power domain ?
HS buffer = +/- 1.2V
HP buffer = +/- 1.2V
IV buffer = +/-1.2V
DAC=+1.25/ -0.95
ADC=2.8V
SPK amp = VBAT
Cap less LDO(for NCP) = 1.8V
6 [FAQ04704][Audio]AFE Supply Power Source
MT6320 Audio block (exclude speaker):
Positive power source : AVDD28_AUD/AVSS28_AUD pair
Negative power source : AVDD18_AUD/AVSS18_AUD pair
VBAT_AUD supply some little MISC circuit.
MICBIAS 0/1 power source is AVDD28_AUD/AVSS28_AUS pair too.
Both can provide max. 2mA current (All MTK platform’s MICBIAS follow this spec)
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参考资料:
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