3.5.3 Reset
The MT6305 contains a reset circuit that is active at both power-up and power-down.
The RESET pin is held low at initial power-up, and the reset delay timer is started. The
delay is set by an external capacitor on RSTCAP:
(1) At power-off, RESET will be kept low.
3.5.4 Over temperature Protection
If the die temperature of MT6305 exceeds 165°C, the MT6305 will disable all the
LDOs except the RTC LDO. Once the over temperature state is resolved, a new power
on sequence is required to enable the LDOs.
3.5.5 Battery Charger
The MT6305 battery charger can be used with Li-ion and NiMH batteries. BATUSE
pin can set MT6305 to fit the battery type. When BATUSE is set low, Li-ion battery is
used. When BATUSE is set high, then NiMH battery is used. MT6305 charges the
battery in three phases: pre-charging, constant current mode charging, and constant
voltage mode charging. Figure 2 shows the flow chart of charger behavior. The
circuitry of MT6305 combines with a PMOS transistor, diode, current-sense resistor
externally to form a simple and low cost linear charger shown in Figure 4. MT6305 is
available pulsed top-off charging algorithm by the CHRCNTL pin control from
baseband chipset.
Содержание SP-770
Страница 1: ...SP 770 AS Manual GSM GPRS Cellular Phone SKYSPRING VITELCOM...
Страница 6: ...SECTION1 SP 770 PRODUCT OVERVIEW...
Страница 27: ...Figure4 Battery Charger Flow chart...
Страница 36: ...SECTION2 SCHEMATIC LAYOUT 1 MAIN PART SCHEMATIC LAYOUT 1 1 BASEBAND PART...
Страница 37: ...1 2 MMI PART...
Страница 38: ...1 3 RF PART...
Страница 39: ...2 MAIN KEY PART SCHEMATIC LAYOUT...
Страница 40: ...3 LCD...
Страница 41: ...SECTION3 PCB LAYOUT 1 MAIN PCB 1 1 Location Map of Main PCB Top...
Страница 42: ...1 2 Location Map of Main PCB Bottom...
Страница 43: ...2 MAIN KEY PCB 2 1 Location Map of Main KEY PCB Top...
Страница 44: ...2 2 Location Map of Main KEY PCB Bottom...
Страница 45: ...3 LCD PCB...
Страница 46: ...SECTION4 MECHANICAL ASSEMBLY...
Страница 48: ...3 LOGIC PART TROUBLESHOOTING...
Страница 50: ...3 2 Troubleshooting 2 LCD Display Backlight error...
Страница 51: ...3 3 Troubleshooting 3 Key push error...
Страница 52: ...3 4 Troubleshooting 4 Vibrator error...
Страница 53: ...3 5 Troubleshooting 5 MP3 Play error...
Страница 54: ...3 6 Troubleshooting 6 Camera Preview error...
Страница 55: ...3 7 Troubleshooting 7 FM Radio Play error...
Страница 57: ...3 9 Troubleshooting 9 Bluetooth error...
Страница 58: ...4 RF PART TROUBLESHOOTING...
Страница 59: ...4 1 Troubleshooting 10 RX path check...
Страница 60: ...4 2 Troubleshooting 11 TX path check...
Страница 64: ...4 Settings 4 1 Flash Tool setting 1 Firstly Check values of the setting in an Options menu...
Страница 66: ...5 SW Downloading 1 Connect LT cable to the PC 2 Press the Download button...
Страница 67: ...3 Connect LT cable to the target mobile phone with power off 4 Completion of downloading...
Страница 74: ...5 4 Save back up NVRAM data as a file Save back up NVRAM data from target as a file...
Страница 77: ...6 4 Download to flash Click download to flash button and then updating parameters is complete...