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X700 Training Course

X700 Training Course. Power Control. X700 Power Control Section. The X700 Power Control Section consists of the following components:

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X700 Training Course

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  1. X700 Training Course Power Control

  2. X700 Power Control Section The X700 Power Control Section consists of the following components: 1.) SM-PWR IC (U304): U304 is a power management ASIC with complete on/off logic and charging control, regulators, LED drivers, 8 ohm speaker & vibrator driver. Controlled by S-GOLD over the I2C interface. 2.) Companion IC (U300): U300 is an ASIC that complements U304 providing additional functionality like back-up battery charging, boost converter, additional regulators and audio switching including stereo/mono headset. Controlled by S-GOLD over the I2C interface. 3.) Battery: A single 780mAH (Li-Ion) cell with a nominal voltage of 3.7V. 4.) Back-Up Battery: 3.0V, 0.5mAH coin cell. 5.) Charger: 5.6V, 700mAH applied at the I/O Connector.

  3. X700 Power Control Section Description of X700 Power Supplies

  4. X700 Power Control Section Layout – X700 Power Control Section

  5. X700 Power Control Section Schematic: Companion IC

  6. X700 Power Control Section Schematic: SM-POWER IC

  7. X700 Power Control Section Power Control Logic The power on sequence can be initiated when a valid battery voltage is applied (VBATT>3.1). One of following conditions start the Power Up sequence. 1.) Power key is pushed for more than (1,000)ms 2.) Application of a charger voltage EXT_PWR>4.0v 3.) Real Time Clock alarm generated by U100(SGOLD) RTCOUT=1 The Power Up sequence is as follows: 1.) U304 band gap reference is activated. 2.) U304 checks VBATT voltage. If VBATT>3.1 then power-up, Else check for VBATT while power-up event is valid. 3.) The following U304 regulators are enabled in sequence: VRF2, SDBB, VLBB2, VLBB1, VINT, VANA, VSIM1, V28, VSD, VUSB. 4.) After U304 VINT is enabled, U300 VLBB3 is also enabled. 5.) After U304 VUSB is enabled, U304-41(INTOUT) will go low followed by U304-48(RESET_N) going high releasing U100 SGOLD from reset. 6.) U100 boot code will determine if the power-up sequence is valid. If valid then provide clock to U200 (13MHz and 32kHz) and release U100 from reset (AP_RST); Else send ALL_OFF command to U304 to power-down the system. 7.) U200 power-up to complete the turn-on sequence.

  8. The power-down sequence of the phone is as follows: Power-down sequence is initiated by the detection of a valid SW428 ON/OFF key press or a low battery voltage condition has been detected. U200 determines that a valid power-down sequence was detected. U200 disables both active hardware and software application. After U200 power-down sequence is completed, a command to U100 is sent to disable U304. U100 initiates its power-down sequence then resets U200 and remove clock. After U100 power-down sequence is completed, an ALL_OFF command to U304 is sent to disable all regulators. X700 Power Control Section

  9. X700 Power Control Section Batter Charging & Monitoring: The estimated battery capacity is displayed as a LCD battery icon. It is derived from battery voltage and current consumption measurements.

  10. Any questions?

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