PCA5010 datasheet(71/112 Pages) PHILIPS

71 / 112 page

1998 Nov 02

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5010

6.22.9

DC/DC CONTROL REGISTER (DCCON0)

The DCCON0 special function register is used to control the operation of the on-chip DC/DC converter.

Table 56 DC/DC Control Register (DCCON0, SFR address D1H)

Table 57 Description of the DCCON0 bits

76543210

OFF

SBY

RXE

SBLI

−−

STB

BLI

BIT

SYMBOL

FUNCTION

DCCON0.7

OFF

Writing this SFR bit to logic 1 puts the DC/DC converter in the off mode (independent of

other control bits).

DCCON0.6

SBY

Writing this SFR bit to logic 1 puts the DC/DC converter in the standby mode, where the

DC/DC converter is clocked from the 76.8 kHz oscillator and the ripple voltage will be

higher. If the DC/DC converter is unable to deliver enough current in SBY mode, the

software has to reset the SBY mode.

DCCON0.5

RXE

Writing this SFR bit to logic 1 uses the stored set of coefﬁcients from a local register to

force the DC/DC converter into the state which is appropriate for the required current.

The contents of this local register are maintained when the DC/DC converter is set into

off state. For the ﬁrst time after connecting VBAT a set of default coefﬁcients is used.

Writing this bit to logic 0 copies the actual coefﬁcients used momentary by the DC/DC

converter back to the local register.

DCCON0.4

SBLI

Writing this SFR bit to logic 1 enables the circuitry for measurement of the battery

voltage. The new BLI value is valid 0.5 ms later. In order to make a new measurement,

the receiver should draw current (continuous mode of DC/DC converter). If SBLI is

logic 0 (BLI measurement disabled) BLI will go to HIGH.

DCCON0.3

−

Unused.

DCCON0.2

−

Unused.

DCCON0.1

STB

Set by the DC/DC converter after power-up. Reset by DC/DC converter if the

converter is not able to deliver the required power. The signal is set in SBY and non

SBY mode. This bit is read only.

DCCON0.0

BLI

Battery low indicator. Set by DC/DC converter if VBAT < 1100 mV ±50 mV. This bit is

read only.

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