Hardware Interface Description - KORE Telematics

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XT55/56 Hardware Interface Description Confidential / Released s Function Signal name IO Signal form and level Comments SIM interface GSM_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 GSM_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 GSM_CCIO IO 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 GSM_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 GSM_CCVCC O R O max = 5Ω GSM_CCVCCmin = 2.84V, GSM_CCVCCmax = 2.96V Imax = -20mA GSM_CCGND Ground GSM_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 GSM_CCGND is mandatory. ASC0 interface GSM_RXD0 GSM_TXD0 GSM_CTS0 GSM_RTS0 GSM_DTR0 GSM_DCD0 GSM_DSR0 GSM_RING0 O I O I I O 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 GSM_DTR0, GSM_RTS0: Imax = -90µA at V IN = 0V GSM_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 GSM_VDD or pull-down resistors tied to GND. See Chapter 3.3.2.1. If unused keep pins open. ASC1 interface GSM_RXD1 GSM_TXD1 GSM_CTS1 GSM_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 GSM_VDD or pull-down resistors tied to GND. See Chapter 3.3.2.1. If unused keep pins open. Digital audio interface GSM_RFSDAI GSM_RXDDAI GSM_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. GSM_TFSDAI GSM_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 XT55/56_hd_v02.06a Page 92 of 125 17.12.2004
XT55/56 Hardware Interface Description Confidential / Released s Function Signal name IO Signal form and level Comments Analog audio GSM_EPP2 O V O max = 3.7Vpp The audio output is interfaces See also Table 32. balanced and can directly GSM_EPN2 O operate an earpiece. If unused keep pins open. Explanation of signal names: P = positive, N = negative GSM_EPP1 GSM_EPN1 GSM_MICP1 GSM_MICN1 GSM_MICP2 GSM_MICN2 O O I I I I V O max = 3.7Vpp See also Table 32. R I ≈ 50kΩ differential V I max = 1.03Vpp See also Table 33. R I = 2kΩ differential V I max = 1.03Vpp See also Table 33. 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. Antenna power Internal antenna power GPS_VANT I Max. 8V DC Max. 25 mA GPS_VCC_RF O Typ.: 3.0V ±5% DC Max: 25 mA Power supply for active antenna; in case of 3V antenna can be connected to GPS_VCC_RF Regulates 3V output for feeding a 3V active GPS antenna GPS power GPS_VCC I Typ.: 3.3V ±5% DC Typ. 80 mA (without feeding GPS_VCC_RF) 50 mV ripple Digital Input / Output GPS_GPIO0 I/O CMOS 3.3V DC level See Chapter 4.5 Digital Input / Output Digital Input / Output Digital Input / Output Digital Input / Output Digital Input / Output Digital Input / Output Digital Input / Output Digital Input / Output Digital Input / Output GPS_GPIO1 I/O CMOS 3.3V DC level See Chapter 4.5 GPS_GPIO3 I/O CMOS 3.3V DC level See Chapter 4.5 GPS_GPIO4 I/O CMOS 3.3V DC level Output for Trickle Power mode. Connect externally to GPS_RFPC1. Usable as LED control output, see Chapter 4.7 GPS_GPIO5 I/O CMOS 3.3V DC level See Chapter 4.5 GPS_GPIO6 I/O CMOS 3.3V DC level See Chapter 4.5 GPS_GPIO7 I/O CMOS 3.3V DC level See Chapter 4.5 GPS_GPIO8 I/O CMOS 3.3V DC level Output for Trickle Power mode. Connect externally to GPS_RFPC0. Usable as LED control output, see Chapter 4.7 GPS_GPIO10 I/O CMOS 3.3V DC level See Chapter 4.5 GPS_GPIO13 I/O CMOS 3.3V DC level See Chapter 4.5 XT55/56_hd_v02.06a Page 93 of 125 17.12.2004
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