Silvertel Ag102 User manual

Silvertel
Rev 1.0 – June 2010
Ag102 Evaluation Board
User Manual

Ag102 Evaluation Board User Manual 1
1 Table of Contents
1Table of Contents 1
2Table of Figures 1
3Introduction 2
4Board Description 2
4.1Input....................................................................................................................2
4.2Output .................................................................................................................3
4.3Capacity Selection...............................................................................................3
4.4Simulated Thermal Offset....................................................................................4
4.5Status Output ......................................................................................................4
5Using the Board 6
6EVALAg1x2 Evaluation Board Schematic 7
2 Table of Figures
Figure 1: Board Layout....................................................................................................2
Figure 2: Capacity selection link......................................................................................3
Figure 3: Ag102 Status Output........................................................................................5
Figure 4: Example set-up................................................................................................6
Figure 5: EVALAg1x2 1R Schematic...............................................................................7

Ag102 Evaluation Board User Manual 2
3 Introduction
This manual is a guide to using the “EVALAg1x2” (Rev 1R or higher) evaluation board
with our Ag102 Sealed Lead Acid (SLA) battery charger module. The EVALAg1x2
evaluation board can be powered by a bench power supply with a range of 9V to 36V
and will charge SLA batteries with a capacity between 1.2Ah and 7Ah.
4 Board Description
4.1 Input
The input power is supplied to the board through connector J12 (see Figure 1), this is a
standard 2.5mm DC10 connector. The centre pin of the connector is positive and the
outer is negative. The input current can be measure by removing LK1 and connecting
an ammeter across these pin.
LED1 will be illuminated when the input supply is ON.
Figure 1: Board Layout

Ag102 Evaluation Board User Manual 3
4.2 Output
The output connections to the SLA battery are made through J1 (positive) and J11
(negative). The output current can be measure by removing LK2 and connecting an
ammeter across these pin.
4.3 Capacity Selection
The EVALAg1x2 evaluation board can set the Ag102 capacity from 1.2Ah to 7Ah by
setting the corresponding jumper link on J6 (see Figure 2 and Table 1).
Figure 2: Capacity selection link
J6 Resistor
Selection RCS Resistance
(Ohms ±1%) Battery
Capacity (Ah) Min Input
Voltage (V) Bulk Charge Current
Limit (A) ±10%
R3 1K 1.2 9 0.3
R4 2K7 2 9 0.5
R5 4K3 2.1 9 0.525
R6 6K8 2.3 9 0.575
R7 10K 2.8 9 0.7
R8 15K 3.2 12 0.8
R9 24K 4 12 1
R10 43K 7 12 1
Table 1: Output Connections
Note: to prevent damaging the battery it is important that the correct value of RCS is set. If the selector link is not fitted, then the
Ag102 will default to 1.2Ah capacity.

Ag102 Evaluation Board User Manual 4
4.4 Simulated Thermal Offset
During Float charge SW1 can be used to demonstrate how the voltage changes to
compensate for the change in battery temperature if an appropriate thermistor is fitted.
With both switch positions open, the Ag102 will default to a 25ºC ambient charge
voltage.
When switch No. 1 is closed R1 (220K) this will simulate a battery temperature lower
than 25ºC and the output voltage will be increase.
When switch No. 2 is closed (18K) this will simulate a battery temperature higher than
25ºC and the output voltage will decrease (this response will be slow when the Ag102 is
float charging).
When both switches are closed this will simulate a battery temperature higher than
50ºC, the output will switch OFF and the over temperature error LED (5) will illuminate.
Opening one or both switches will return the Ag102 to its normal charge mode.
4.5 Status Output
The Ag102 status output pin is connected to a PIC10F200 µ-controller as detailed in the
application note “AN102-3”. The EVALAg1x2 board used a 3-8 decoder IC (74HC138)
to drive LEDs (2 to 9) displaying the status of the Ag102 (see Figure 3).
1. When the battery is charging LED9 (Normal Charge) will be illuminated.
2. When the Ag102 detects a low battery capacity, it will continue to charge the
battery and LED3 (Battery Capacity Warning) will be illuminated.
3. When the battery is disconnected the Ag102, LED4 will be illuminated.
4. When the Ag102 detects the (simulated) thermistor has exceeded 50ºC, it will
stop charging the battery and LED5 (Over Temperature) will be illuminated.
When the Ag102 detects that the battery temperature has dropped back below
50ºC, it will resume charging the battery (as shown in No.1 above)

Ag102 Evaluation Board User Manual
5
5. When the Ag102 detects that excessive current is being drawn from the output, it
will stop charging the battery and LED6 (Over Current) will illuminate. This is
considered to be a major fault condition that needs manual intervention.
Therefore the power to the evaluation board has to be removed and reapplied
before the Ag102 will resume charging the battery.
Figure 3: Ag102 Status Output

Ag102 Evaluation Board User Manual
7
6 EVALAg1x2 Evaluation Board Schematic
Figure 5: EVALAg1x2 1R Schematic
Table of contents
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