Circuit Diagram and legends of a set of Nokia data lines

Nokia line Specification

Line Specification	Fbus	Mbus	Fbus & mbus
Line functions	-Sending and receiving faxes and surfing the internet -Send and receive short messages -Edit the phone book (Chinese and English). The Chinese phone book is applicable to 6100 and 6150. -Transmit MIDI music, songs to phone (applicable to 6100 & 6150) -Change the group display icon (applicable to 6110 & 6150) -Change the standby Screen -Write workbooks, meetings, and birthday reminders in English. -Enable project mode	Change the boot screen (applicable to 6110 & 6150) -Adjust screen comparison (Light and Dark) -Test and adjust the mobile phone number -Change the mobile phone Password -Watch mobile phone production materials -And many maintenance functions (methods to be studied)	Contains the front and the front. All functions are automatically based on The software is switched to the required line.

Nokia Mobile Phone Transmission LineCircuit Diagram of Nokia 61xx and 51xx Transmission Lines    Original circuit diagram (using Maxim 3232)   Layout diagram of the original circuit (using Maxim 3232)     Circuit Diagram after modification (using Maxim 232cpe or hin232cp) Layout diagram of the modified circuit (using Maxim 232cpe or hin232cp) Mobile phone pin chart   1-vin charger input voltage 8.4 v 0.8a 2-chrg CTRL charger control PWM 32 kHz 3-xmic mic input 60 mV-1 V 4-sgnd signal ground 5-xear ear output 80 mV-1 V 6-MB us 9600 bps 7-fbus_rx 115.2 kbps 8-fbus_tx 115.2 kbps 9-l_gnd charger/logic Gnd

Nokia 8110 transmission line diagram    Mobile phone pin chart   Pin 　 　 1 Gnd Charger/system ground 2 V_out Accessory output supply. (min/typ/max-3.4v...10v-output current 50mA) 3 Xmic External microphone input and Accessory Identification Identification * Typ/MAX: 8... 50 mV (the maximum value corresponds to 0dbm Network Level with input Amplifier Gain set to 20 dB, typical value is maximum value-16 dB) 　 ID Accessory Identification * 1, 7... 2, 05 V headset adapter connected * 1, 15... 1, 4 V compact handsfree unit connected * 2. 22... 2.56 v infra red link conneceted 4 Ext_rf External RF Control Input MIN/MAX: 0... 0.5 V External RF in use MIN/MAX: 2. 4... 3.2 V internal antenna in use 5 TX Fbus transmit * Accessory fbus transmit signal 6 Mbus Serial control bus * Logic low level: 0... 0.5 V * Logic high level: 2.4v...3.2v 7 Bena Not connected 8 Sgnd Signal ground 9 Xear External speaker and mute Control * Min/typ/MAX: 0... 32... 500 mV (typical level corresponds to-16 dBm) Network Level with volume control in nominal position 8db below maximum Maximum 0 dBm maximum volume codec gain-6db) Mute on (HF speaker mute): 0... 0, 5 V D.C. Mute off (HF speaker active): 1, 0... 1, 7 V D.C. 10 Hook Hook Signal * Hook off (handset in use): 0... 0.5 V * Hook on (handset in use): 2.4v...3.2v 11 RX Fbus receive * Accessory fbus receive signal 12 V_in Charging supply voltage (max 16 V)

Note: 1. Most of the maximparts available on the market are232CPE (C table working range, PE table 16pin dip packaging), so if you want a relatively high speed, you need to use 1 UF capacitor, the speed can reach 120 kbps, if you use 0.1uf, the speed is only 64 Kbps.Maxim 232aCPE provides a speed of kbps as long as 0.1uf is used. 2. the consumption current of Maxim 232 is relatively large. If we use around two pairs of communication ports, we need a 15ma current. Because we only use one pair of communication ports, it will be a little smaller, however, at present, some computers and notebook COM ports are designed to be low-voltage, so some people cannot work normally with Maxim 232. You can use hirris hin232cp (16pin dip package) to consume less current, as long as 5ma, if no more, you can take the voltage regulator IC 78l05 together, the method to see the following practices.

Example of self-made circuit (using hirris hin232cb SMT ic)   Hirris hin232cb smt ic appearance   Directly weld the capacitor and wiring on the IC. The combination diagram directly connects components such as diode, voltage-regulated IC 78l05, capacitance 10 UF (SMT) to the D-type 9pin RS-232 connector (PS. this circuit does not use 78l05, but is directly replaced by a 5.1 v diode and resistor), such   Back View   Replacing the voltage regulator IC 78l05 with a 5.1 v diode and Resistor The two 2.7 V inner diodes on the circuit are directly welded to the mobile phone connector, and the original line without the receiver is changed to the signal line.   After you finish, you will only see the phone connector and RS-232 Connector