SC14CVMDECT datasheet(20/57 Pages) DIALOG

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Datasheet

Revision 3.0

28-Jul-2015

CFR0011-120-00-FM Rev 5

20 of 57

SC14CVMDECT SF

Cordless Voice Module

FINAL

The clock can also be read and set directly from an

external microprocessor or through the MMI software

on the FP.

The real-time clock accuracy depends directly on the

SC14CVMDECT SF crystal.

When the SC14CVMDECT SF is configured as a PP,

the clock has the same accuracy as the FP clock.

When the PP synchronises with an FP, the PP crystal

is synchronized with the FP crystal and the PP clock

will change accordingly.

The accuracy is expected to be within 1 minute for up

to 6 weeks without being locked to an FP.

4.9 BATTERY MANAGEMENT

Figure 18 shows a handset application with NiMH.

SOC (State Of Charge) is used to measure the amount

of charge in the rechargeable batteries.

Figure 19 shows an FP application. The FP uses an

external LDO, so the SOC pins are not used and can

be connected to GND.

The PP API supports battery management to calculate

the battery capacity and to indicate charge status.

Refer to API document [2].

The SOC circuit is used to very accurately determine

the amount of charge in rechargeable batteries as well

as the discharge state of Alkaline batteries. This infor-

mation is essential for the battery charging algorithm

and necessary for battery status indication to the user.

Battery status information is supported by the API.

Detailed information can be found in AN-D-174 (Bat-

tery Management) [5].

Pin CHARGE_CTRL is driven high when either the

“sensed voltage on the VBAT pin” is lower than the

voltage setting or “sensed current via SOCp” is lower

than the current setting. Pin CHARGE_CTRL can drive

up to 500

A as source current (see Table 32). Detailed

setting information can be found in document [4] under

“Battery settings”.

4.10 PROTOCOL STACK

The protocol stack handles the RF interface, the MAC-,

DLC-, NWK-layer and encryption according to the

DECT standard EN300 175 1-9.

4.10.1 DECT TBR22

The SC14CVMDECT SF supports the DECT GAP

standard according to EN300 444. For TBR22 type

approval (optional) switching off the authentication and

encryption is required, which can be done with the VES

parameter Tbr_22.

Figure 17: Clock synchronization

Figure 18: Handset (PP) application with 2x NiMH

100

0.1

SO C

V supply

VB AT IN

Figure 19: Base station (FP) application

SO C

Vsupply

VB A T IN

LD O

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