ICS1712S datasheet(15/28 Pages) GALAXY

15 / 28 page

ICS1712

•Using no temperature sensor:

If a temperature sensor is not used, the THERM pin must be

grounded.

Termination Selection: DTSEL Pin

The ICS1712 has the capability of either temperature slope

termination,

voltage

slope

termination

both

methods

simultaneously. The DTSEL pin has an internal 75k

Ω pull-down

resistor that enables voltage slope termination as the primary

method and is the default condition. Tying the pin high enables

both temperature slope and voltage slope termination methods.

Temperature slope termination as the primary method is enabled by

tying the DTSEL pin to the CMN output (pin 4). CMN must have

an external 15k

Ω or lower value pull-up resistor to V

for proper

activation of temperature slope termination. The ICS1702 must be

reset if a new termination method is desired. Table 6 summarizes

the DTSEL pin settings. NOTE: Maximum temperature and fast

charge timer termination methods are always enabled when using

temperature slope termination. Refer to the sections on Fast

Charge

Timer

Termination

and

Maximum

Temperature

Termination for more information.

Table 6: Termination Select List

Tie DTSEL

Pin to ...

Result

Low

(No Connect)

Voltage slope termination only

High

Voltage slope and temperature slope

termination

CMN

Temperature slope termination only

(CMN with external pull-up to VDD)

Voltage Input: VIN Pin

The battery voltage must be normalized by an external resistor

divider network to one cell. The electrochemical potential of one

cell is about 1.2V. For example, if the battery consists of six cells

in series, the voltage at the VIN pin must be equal to the total

battery voltage divided by six. This can be accomplished with two

resistors, as shown in Figure 13. To determine the correct resistor

values, count the number of cells to be charged in series. Then

choose either R1 or R2 and solve for the other resistor using:

R1 = R2 * (# of cells -1) or R2 =

(# of cells -1)

Figure 13: Resistor divider network

at the VIN pin

Power: VDD Pin

The power supply for the device must be connected to the VDD

pin. The voltage should be +5 VDC and should be supplied to the

part through a regulator that has good noise rejection and an

adequate current rating. The controller requires up to a maximum

of 11mA with VDD=5.00V.

Grounding: VSS, AVSS Pins

There are two ground pins. Both pins must be connected together

at the device. This point must have a direct connection to a solid

ground plane.

VIN pin

# of cells

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