Intermec 073292-001 用户手册

The AD1 requires 12 VDC at 4A. The 073573 power supply is qualified 
for use with the AD1. 

The AD2 can charge four CK30 units at the same time.  It also provides 
four DB9 male connectors for serial communications and one 8-pin RJ45 
connector for 10/100 Ethernet communications. The AD2 also has four 
26-pin JAE connectors for interfacing with four CK30s. Refer to 
“Connector Pin-Outs” on page 96 for the connector pin-outs. 

The four 26-pin JAE connectors are right-angle connectors mounted on 
separate PCBs; each interfaces to the AD2 main PCB through two 10-pin 
headers (J3, J5, J11, J13, J19, J21, J27 and J29). 

A CK30 that is inserted into the AD2 is powered directly from the 12V 
supply. J6, J14, J22 and J30 are the contacts by which power is transferred 
to each of the four CK30s. 

The AD2 has a five-port 10/100 Ethernet switch to allow the end user to 
connect four CK30s to their network. The switch chip is a Micrel/Kendin 
part number KS8995X. 

The AD2 has four identical charging circuits, one for each slot in the dock. 

U2 (TI BQ2954) controls all aspects of charging for the AD2. It uses a 
constant current/constant voltage-charging algorithm. The AD2 is 
designed to charge the CK30 battery pack with a maximum charge current 
of 833 mA. The sense resistor (R80) is what sets the maximum charge 
current (Imax = 250 mV/R80). The AD2 is also designed to only allow 
charging between 0ºC and 45ºC ±7ºC. A battery that has been discharged 
through normal use on a CK30 recharges in less than five hours on the 
AD2. 

J7, J8, and J9 are the contacts by which the CK30 battery interfaces to the 
charging circuitry. The voltage divider formed by R90 and R91 is used to 
notify the BQ2954 that a battery has been inserted. It is also used to 
determine whether to begin charging based on the battery voltage and an 
internal reference voltage in the BQ2954. 

Temperature monitoring is done using a voltage divider formed by R96, 
R98, and a NTC thermistor (R130). If the battery voltage is at a value that 
the BQ2954 identifies as being below the reference voltage, and the 
ambient temperature is within acceptable limits then a charge cycle begins. 

When a charge cycle begins, pin 14 on the BQ2954 is modulated at 
100kHz. This pin controls a buck switcher formed by Q10, D36, and L3. 
This switcher is set to provide a constant 8.4 VDC from the 12 VDC 
supply. Once the battery has reached 8.4V (+100 mV–10 mV) then the 
BQ2954 switches to the constant voltage phase of the charge cycle.