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ICL3223CV Datasheet(PDF) 11 Page - Intersil Corporation |
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ICL3223CV Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 28 page 11 FN4805.21 March 1, 2006 Software Controlled (Manual) Powerdown Most devices in the ICL32XX family provide pins that allow the user to force the IC into the low power, standby state. On the ICL3222 and ICL3241, the powerdown control is via a simple shutdown (SHDN) pin. Driving this pin high enables normal operation, while driving it low forces the IC into its powerdown state. Connect SHDN to VCC if the powerdown function isn’t needed. Note that all the receiver outputs remain enabled during shutdown (See Table 2). For the lowest power consumption during powerdown, the receivers should also be disabled by driving the EN input high (See next section, and Figures 2 and 3). The ICL3221, ICL3223, and ICL3243 utilize a two pin approach where the FORCEON and FORCEOFF inputs determine the IC’s mode. For always enabled operation, FORCEON and FORCEOFF are both strapped high. To switch between active and powerdown modes, under logic or software control, only the FORCEOFF input need be driven. The FORCEON state isn’t critical, as FORCEOFF dominates over FORCEON. Nevertheless, if strictly manual control over powerdown is desired, the user must strap FORCEON high to disable the automatic powerdown circuitry. ICL3243 inverting (standard) receiver outputs also disable when the device is in manual powerdown, thereby eliminating the possible current path through a shutdown peripheral’s input protection diode (See Figures 2 and 3). TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE RS-232 SIGNAL PRESENT AT RECEIVER INPUT? FORCEOFF OR SHDN INPUT FORCEON INPUT EN INPUT TRANSMITTER OUTPUTS RECEIVER OUTPUTS (NOTE 4) ROUTB OUTPUTS INVALID OUTPUT MODE OF OPERATION ICL3222, ICL3241 N.A. L N.A. L High-Z Active Active N.A. Manual Powerdown N.A. L N.A. H High-Z High-Z Active N.A. Manual Powerdown w/Rcvr. Disabled N.A. H N.A. L Active Active Active N.A. Normal Operation N.A. H N.A. H Active High-Z Active N.A. Normal Operation w/Rcvr. Disabled ICL3221, ICL3223 No H H L Active Active N.A. L Normal Operation (Auto Powerdown Disabled) No H H H Active High-Z N.A. L Yes H L L Active Active N.A. H Normal Operation (Auto Powerdown Enabled) Yes H L H Active High-Z N.A. H No H L L High-Z Active N.A. L Powerdown Due to Auto Powerdown Logic No H L H High-Z High-Z N.A. L Yes L X L High-Z Active N.A. H Manual Powerdown Yes L X H High-Z High-Z N.A. H Manual Powerdown w/Rcvr. Disabled No L X L High-Z Active N.A. L Manual Powerdown No L X H High-Z High-Z N.A. L Manual Powerdown w/Rcvr. Disabled ICL3243 No H H N.A. Active Active Active L Normal Operation (Auto Powerdown Disabled) Yes H L N.A. Active Active Active H Normal Operation (Auto Powerdown Enabled) No H L N.A. High-Z Active Active L Powerdown Due to Auto Powerdown Logic Yes L X N.A. High-Z High-Z Active H Manual Powerdown No L X N.A. High-Z High-Z Active L Manual Powerdown NOTE: 4. Applies only to the ICL3241 and ICL3243. ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243 |
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