SI3232 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3232

DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING

Silicon Laboratories 

Si3232

SVBAT

Battery

Sensing

Circuit

Battery

Logic

Control

BATSEL

806 kΩ

VBLO

VBHI

Si3232

Si3200

Linefeed

Circuitry

VBATL

VBAT

VBATH

40.2 kΩ

BATSEL

Battery

Select

Control

Figure 12. External Battery Switching Using the Si3232 and Si3200

When generating a high-voltage ringing amplitude using the Si3220, the power dissipated during the OHT state

typically increases due to operating from the ringing battery supply in this mode. To reduce power, the Si3232/

Si3200 chipset provides the ability to accommodate up to three separate battery supplies by implementing a

secondary battery switch using a few low-cost external components as illustrated in Figure 13. The Si3232’s

BATSEL pin is used to switch between the VBHI (typically –48 V) and VBLO (typically –24 V) rails using the switch

internal to the Si3200. The Si3232’s GPO pin is used along with the external transistor circuit to switch the VBRING

rail (the ringing voltage battery rail) onto the Si3200’s VBAT pin when ringing is enabled. The GPO signal is driven

automatically by the ringing cadence provided that the RRAIL bit of the RLYCON register is set to 1 (signifying that

a third battery rail is present).

30

Preliminary Rev. 0.96

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