Hardware Interface Description - Wireless Data Modules

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MC55/56 Hardware Interface Description Confidential / Released s Function Signal name IO Signal form and level Comments SIM interface CCIN I R I ≈ 100kΩ V IL max = 0.5V V IH min = 2.15V at I = 20µA, V IH max=3.3V at I = 30µA CCRST O R O ≈47Ω V OL max = 0.25V at I = 1mA V OH min = 2.3V at I = -1mA V OH max = 2.73V CCIO I/O R I ≈10kΩ V IL max = 0.5V V IH min = 1.95V, V IH max=3.3V R O ≈220Ω V OL max = 0.4V at I = 1mA V OH min = 2.15V at I = -1mA V OH min = 2.55V at I = -20µA V OH max = 2.96V CCCLK O R O ≈220Ω V OL max = 0.4V at I = 1mA V OH min = 2.15V at I = -1mA V OH max = 2.73V CCVCC O R O max = 5Ω CCVCCmin = 2.84V, CCVCCmax = 2.96V Imax = -20mA CCGND Ground CCIN = high, SIM card holder closed (no card recognition) Maximum cable length 200mm to SIM card holder. All signals of SIM interface are protected against ESD with a special diode array. Usage of CCGND is mandatory. ASC0 interface /RXD0 /TXD0 /CTS0 /RTS0 /DTR0 /DCD0 /DSR0 O I O I I O O V OL max = 0.2V at I = 1mA V OH min = 2.35V at I = -1mA V OH max = 2.73V V IL max = 0.5V V IH min = 1.95V, V IH max=3.3V /DTR0, RTS0: Imax = -90µA at V IN = 0V /TXD0: Imax = -30µA at V IN = 0V First serial interface for AT commands or data stream. To avoid floating if output pins are high-impedance, use pull-up resistors tied to VDD or pull-down resistors tied to GND. See Chapter 3.3.2.1. If unused keep pins open. /RING0 O ASC1 interface /RXD1 /TXD1 /CTS1 /RTS1 O I O I V OL max = 0.2V at I = 1mA V OH min = 2.35V at I = -1mA V OH max = 2.73V V IL max = 0.5V V IH min = 1.95V, V IH max=3.3V I I max = -90µA at V IN = 0V Second serial interface for AT commands. To avoid floating if output pins are high-impedance, use pull-up resistors tied to VDD or pull-down resistors tied to GND. See Chapter 3.3.2.1. If unused keep pins open. Digital audio interface RFSDAI RXDDAI SCLK I I I V OL max = 0.2V at I = 1mA V OH min = 2.35V at I = -1mA V OH max = 2.73V If unused keep pins open. TFSDAI TXDDAI O O V IL max = 0.5V V IH min = 1.95V, V IH max=3.3V I I max = 330µA at V IN = 3.3V MC55/56_hd_v02.06 Page 78 of 105 29.10.2004
MC55/56 Hardware Interface Description Confidential / Released s Function Signal name IO Signal form and level Comments Analog audio EPP2 O V O max = 3.7Vpp The audio output is interfaces See also Table 30. balanced and can directly EPN2 O operate an earpiece. If unused keep pins open. Explanation of signal names: P = positive, N = negative EPP1 EPN1 MICP1 MICN1 MICP2 MICN2 AGND O O I I I I V O max = 3.7Vpp See also Table 30. R I ≈ 50kΩ differential V I max = 1.03Vpp See also Table 31. R I = 2kΩ differential V I max = 1.03Vpp See also Table 31. Balanced audio output. Can be used to directly operate an earpiece. If unused keep pins open. Balanced microphone input. To be decoupled with 2 capacitors (C K = 100nF), if connected to a microphone or another device. If unused keep pins open. Balanced microphone input. Can be used to directly feed an active microphone. If used for another signal source, e.g. op amp, to be decoupled with capacitors. If unused keep pins open. Separate ground connection for external audio circuits. MC55/56_hd_v02.06 Page 79 of 105 29.10.2004
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Hardware Interface Description - Wireless Data Modules

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