STE12PS datasheet(18/44 Pages) STMICROELECTRONICS

18 / 44 page

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Functional description

STE12PS

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3.4

Internal 3.3V/10V generator

The STE12PS can be configured either as 3.3V and 10V generator or load by means of the

S/U control input. In this manner, the need for extra, low-voltage batteries is avoided, greatly

simplifying the system design. If S/U is left open, the device will operate as an SMPS

controller. With the SMPS configured at 3.3V, the device can be used to power up a “1Amp”

load with high efficiency voltage conversion.

Figure 6 on page 19 shows a typical DC-DC, buck converter configuration for the 3.3V

supply. The 10V supply is generated by means of an internal, linear regulator. The 3.3V

supply can source up to 1A.

Figure 7, use of a small transformer for the 10 V supply can save up to 0.3W for each

powered device. Both the 3.3V and 10V supplies can power others devices.

Figure 8 depicts a typical application with an external supply.

3.5

Logic interface

The STE12PS can operate autonomously - notifying, externally, ports status via dedicated

pins (Parallel Monitor Interface) - or it can be controlled as a slave device via the I2C

interface by a host processor. In the latter case, the host can perform system configurations,

monitor status conditions and assert alarm flags making it possible to drive, manually,

different operations for detection, classification and monitoring.

STE12PS Datasheet(PDF) 18 Page - STMicroelectronics