See Figure 4.1-11
Figure 4.1-11 MTP700 DC Distribution
Several sections of the radio are connected directly to the battery, which supplies RAW_B+ and FUSED_B+.
The radio operates at a low voltage of 5.8Vdc, nominal-level voltage of 7.2Vdc, and high-level voltage of 12Vdc. The battery is connected to J001 pins 3 (+) and J001 pin 1 (-). These pins supply the RAW_B+ to the RF TX power amplifier and the SWB+ current limit regulator. RAW_B+ is routed via F200 (Fuse) becoming FUSED_B+, which is used by the Audio PA, the 3.3V Switching Regulator and the SWB+ switch for the TX Driver bias circuit.
TXPA 7.2V BATTERY
VREF2_2.775V
V4_LNO DC T LC Filter
VREF1
LC Filter V2
VREF2
LC Filter LC Filter
DSC V4 (with Pass Transistor)
VREF3
VSIM PA_B+
LC Filter
LC Filter LC Filter FUSE
MOS_SW
5.5V LIN REG 3.3V SW REG
MOS_SW
MOS_SW
SIDE_CONNECTOR_SWB+
BOTTOM_CONNECTOR_SWB+
AUDIO PA
CORE
ESCORT / TXVCO
REDCAP, DISPLAY, FLASH, SRAM, I/O-Section
Serial VCC for WPIC+
LNODCT
RFCU, RXU, TXPA, TXFE
AND GATE for TCXO_WARP
TX/RX-_LED
Backlight_LED
TS-REF ADC_INPUT
LNODCT_RFOUT, RF PA bias circuit, VCC for Charge Pumps WPIC+, 2ndLO_PLL_IC, ESCORT
BATTERY_Interface_Circuitry
TXPA_Driver bias circuit SOFT_TURN_OFF
LC Filter
TXPA 7.2V BATTERY
VREF2_2.775V
V4_LNO DC T LC Filter
VREF1
LC Filter V2
VREF2
LC Filter LC Filter
DSC V4 (with Pass Transistor)
VREF3
VSIM PA_B+
LC Filter
LC Filter LC Filter FUSE
MOS_SW
5.5V LIN REG 3.3V SW REG
MOS_SW
MOS_SW
SIDE_CONNECTOR_SWB+
BOTTOM_CONNECTOR_SWB+
AUDIO PA
CORE
ESCORT / TXVCO
REDCAP, DISPLAY, FLASH, SRAM, I/O-Section
Serial VCC for WPIC+
LNODCT
RFCU, RXU, TXPA, TXFE
AND GATE for TCXO_WARP
TX/RX-_LED
Backlight_LED
TS-REF ADC_INPUT
LNODCT_RFOUT, RF PA bias circuit, VCC for Charge Pumps WPIC+, 2ndLO_PLL_IC, ESCORT
BATTERY_Interface_Circuitry
TXPA_Driver bias circuit SOFT_TURN_OFF
LC Filter
3.3V Switching Regulator
An external 3.3V switching regulator is used to convert the battery voltage (7.2V) down to 3.3V to be used by GCAP3. This regulator can be set to fixed frequency 600KHz (during Tx & Rx) or variable switching frequency (when idle) depending on the load.
PWM #1 (Pulse Width Modulation)
PWM #1 is a selectable step down switching regulator. It is selectable using the RedCap2 SPIB bus from 1.2V to 2.45V in 6 steps, Pass Through and Power down modes. The switcher is active during Power Reset (POR) in 1.875V mode. It is set to 1.875V. Switch-ing regulator is PWM#1_1.875V, which is the supply for the internal core, emulation port and clock output drivers of the RedCap2. The switcher is supplied from FILT_3.3V and it is active whenever the radio is turned ON.
V1 Linear Regulator
V1 is a programmable linear regulator. It is programmed using the RedCap2 SPIB bus from 0.975V to 3.0V in 8 steps. This regulator is active during POR and its initial value is 1.55V. For this radio, V1 is programmed to 3.0V, supplying ESCORT section by filtered V1_3V. This regulator is active whenever the radio is turned ON.
V2 Linear Regulator
V2 is a selectable linear regulator. It is selectable using the GCAP3 UV_SEL pin (internal logic) between either 2.5V and 2.775V. This regulator is active during POR and its initial output value is set by GCAP3 UV_SEL pin. Connecting UV_SEL pin to FILT_3.3V sets V2 output value to 2.775V, connecting UV_SEL pin to Ground sets V2 output value to 2.5V. For this radio, V2 is selected to 2.775V. This regulator is supplied by FILT_3.3V and it is active whenever the radio is turned ON. V2 is the supply for internal audio circuits, CLK_IN input driver and TS interface.
V3 Linear Regulator
V3 is a selectable linear regulator. It is selectable using the RedCap2 SPIB bus from 1.875V to 2.775V in 4 steps. This regulator is active during POR and its initial output value is 2.775V. For this radio, V3 is selected to 2.775V. The regulator is supplied by FILT_3.3V and it is active whenever the radio is turned ON. V3 is directly used as V3_2.775V_DIG, which is the supply for the RedCap2, Flash, SRAM, GCAP3, Display, logic lines pull-up and 40-pin connector. V3_2.775V is the filtered V3 supply voltage for the Serial VCC of U1001/WPIC+.
V4 Linear Regulator
V4 is a selectable linear regulator with external pass transistor. It is selectable using the RedCap2 SPIB bus from 1.875V to 2.775V in 4 steps. It is set to 2.775V. V4 is always powered from FILT_3.3V and it is active whenever the radio is turned ON. This regulator is active during POR. V4 supplies via the filtered V4_2.775V the RF sections RFCU, RXU, TXPA and TXFE whilst the LNODCT section has an extra filtered supply voltage V4_LNODCT.
VREF1 Linear Regulator
VREF1 is a programmable linear regulator. It is programmed using the RedCap2 SPIB bus from 0.95V to 2.775V. This regulator is active during POR and its initial value is 2.775V. For this radio, VREF1 is programmed to 2.775V and is supplied by FILT_3.3V.
VREF1 is VREF1_2.775V, which is the supply for the AND Gate on TCXO_WARP line.
VREF2 Linear Regulator
VREF2 is a programmable linear regulator. It is programmed using RedCap2 SPIB bus from 0.95V to 2.775V. For this radio, it is programmed to 2.775V which supplies directly (VREF2_2.775_DIG) the backlights and filtered (VREF2_2.775V) the SSC section (Tx/Rx-LED).
TS_REF Linear Regulator
TS_REF is a fixed output linear regulator. It is supplied internally from the V2 linear regu-lator. It is set to 2.3V. The radio uses TS_REF for the AD voltage dividers. It is not active at POR.
5.5V Linear Regulator
This is an external linear regulator fed by SWB+. It is used to supply GCAP3 DSC regula-tor and the Battery Interface Circuitry.
DSC Linear Regulator
DSC is a fixed output linear regulator. This regulator is active during POR in the 5V mode.
DSC is supplied from an external 5.5V linear regulator. The output voltage is filtered (5V_RF) to supply the WPIC+, 2nd LO PLL-IC and ESCORT-IC charge pump circuits, the PA bias OP and LNODCT_RFOUT circuit.
Current Limit
The SWB+ current limit regulator provides power from the phone battery to clip-on acces-sories. It is enabled only when the phone is powered up and an accessory which requires power from the phone is connected.