After Sales
Technical Documentation
RAE/RAK–1N
Baseband
Page 2–27
Original, 08/96
Table 29. External Signals and Connections, Inputs (continued)
FromSignal descriptionSignal Name
PWM Charger on/off control CTRLU
VCHAR Charging voltage B2B conn
VOLTLIM Charging voltage limitation during call; affects HW voltage limit CTRLU
Table 30. External Signals and Connections, Outputs
Signal Name Signal description To
XRES Master reset ASIC
VL1 Logic supply voltage. Max 150 mA. CTRLU,
ASIC, RFI,
UIF
VL2 Logic supply voltage. Max 150 mA. DSPU
VA1 Analog supply voltage for AUDIO block. Max 40 mA. AUDIO
VA2 Analog supply voltage for RFI. Max 80 mA. RFI
VA3 Analog supply voltage for PHF power amplifier. Max 200 mA. AUDIO
VREF Reference voltage 4.65V 2%. Max. 5mA. CTRLU,RF
VBATDET Switched VBATT divided by 2 CTRLU
CHRDET Charger detect output ASIC
VCHARO Charging voltage to battery Batt conn
VC Attenuated VCHAR CTRLU
Block description
The PSL+ IC produces the following supply voltages:
VL1 150 mA for logic
VL2 150 mA for logic
VA1 40 mA for audios
VA2 80 mA for RFI
VA3 200 mA for PHF booster
VREF 5mA reference
In addition, it has internal watchdog, voltage detection and charger
detection functions. The watchdog will cut off output voltages if it is not
reset once in every 5 (+/–1?) seconds. The voltage detector resets the
phone if the battery voltage falls below 4.8 V (+/–0.2V). The charger
detection starts the phone if it is in power–off state when the charging
voltage is applied.
The charging electronics is controlled by the MCU. When the charging
voltage is applied to the phone and the phone is powered up, the MCU
detects it and starts controlling charging. If MCU detects too high charging
voltage (over 10 volts) or current (over 78 A/D bit difference between VC
and VBATDET) it will cut off the charging. The phone will accept charging
voltages from 5 to 13 volts.
To Next Page
Loading...