Technical data

LZT 123 1834 4
2.6.3 PERSONAL MEDICAL DEVICES ............................................................................ 21
2.6.4 DISPOSAL OF OLD ELECTRONIC EQUIPMENT ...................................................... 21
3 Abbreviations ....................................................................................... 22
Integrating the Wireless Modem.................................................................. 24
4 Mechanical Description ......................................................................... 25
4.1 INTERFACE DESCRIPTION .........................................................................................25
4.2 PHYSICAL DIMENSIONS ............................................................................................27
5 System Connector Interface .................................................................. 29
5.1 OVERVIEW................................................................................................................ 29
5.2 DEALING WITH UNUSED PINS.................................................................................... 32
5.3 GENERAL ELECTRICAL AND LOGICAL CHARACTERISTICS ........................................... 34
5.3.1 LEVEL SHIFTER INTERFACES...............................................................................34
5.3.1.1 COMMON LEVEL SHIFTER INTERFACE .............................................................34
5.3.1.2 I2C LEVEL SHIFTER INTERFACE ....................................................................... 36
5.4 GROUNDS................................................................................................................37
5.4.1 ANALOGUE GROUND (AREF) ..............................................................................37
5.4.2 COMMON GROUND (GND)................................................................................. 37
5.5 REGULATED POWER SUPPLY INPUT (VCC) .................................................................. 38
5.6 VOLTAGE REFERENCE (VREF) .................................................................................... 39
5.6.1 VREF AS AN OUTPUT.........................................................................................39
5.6.2 VREF AS AN INPUT ............................................................................................40
5.7 BATTERY CHARGING INPUT (CHG_IN) ....................................................................... 41
5.7.1 CHARGING PROCESS ......................................................................................... 42
5.7.2 SERIES DIODE.................................................................................................... 43
5.7.3 BATTERY SELECTION ......................................................................................... 43
5.8 POWERING THE MODULE ON AND OFF (ON/OFF) ......................................................47
5.8.1 TURNING THE MODULE ON ...............................................................................47
5.8.2 TURNING THE MODULE OFF .............................................................................. 48
5.9 ANALOGUE AUDIO ................................................................................................... 50