Download 401-MAN-E-4312-V4.5, Layout 1

Thermal Printer Module for Integration • GPT-4312 • User Manual
4.5 Battery Charging Circuit (Software Control); General Information
For battery operation, the controller has a charging circuit supported by the processor in the rear
of the board. The battery can be directly connected to the charging circuit through the connector
J4. The charging voltage is supplied through connector J1.
Begin the Charging Process with Start-Up Charge
The charging device consists of a hardware component and the corresponding charger control
software embedded in the ±-processor.
When the charging voltage is applied, the hardware will first check the charging status of the battery. If the battery is determined to be overdischarged, the charging cycle will start out with a
battery-saving start-up charge (the charging status indicator will remain off). If the battery is not
defective, the battery voltage is going to increase and soon exceed the RESET threshold of controller's ±-processor circuit. In order to bridge the RESET threshold, the controller will first generally turn on the charging with low battery voltage (Vp<1,1 Vcc), compensating for the decrease in battery voltage as a result of higher energy use after the initialization.
After the initialization, the applied charging voltage will be registered, and the fast charge will
start by resetting the control criteria for the charge recognition.
Charging Status Indicator
The current status of the charging circuit is indicated through different flash rhythms of the status
LED. Status inquiries through the serial interface are answered with the appropriate feedback. See
chapter 4.7 "Error and Status Messages during Printing" on page 46.
End-of-Charge Recognition
The type of charge recognition requires exact knowledge of the battery parameters.
The layout of the thermal printer controller GCT-4382 V1.4c is designed for two components in
the area of the battery charging circuit:
• Ni-MH battery charging circuit (standard component); see 4.5.1 "Ni-MH Charging Circuit (Standard Component" on this page
• Li-ION battery charging circuit (special version); see4.5.3 "Li-Ion Battery Charging Circuit" on
page 39.
The end-of-charge parameters of each component are taken into consideration by software. After
initialization, these parameters are first determined by the standard values filed in the flash of the
TINIT, however, they can also be overwritten with the commands described below. Of course, the
commands can also be activated by the user in the TINIT of the serial EEPROM.
GeBE E+F GmbH • www.oem-printer.com • GeBE Dok.Nr. MAN-E-401-V4.5 • GPT-4312 • page 36 of 64