PCA9554D,118 I/O Expander 8 I²C, SMBus 400 kHz 16-SO

Kufotokozera

PCA9554 ndi PCA9554A ndi zida za 16-pini za CMOS zomwe zimapereka ma bits 8 a General Purpose parallel Input/Output (GPIO) kukulitsa ntchito za I2C-bus/SMBus ndipo zidapangidwa kuti zithandizire banja la NXP Semiconductors la I2C-bus I/O zowonjezera.Zosinthazi zikuphatikiza kuthekera koyendetsa kwambiri, kulolerana kwa 5 VI / O, kutsika kwapano, kasinthidwe ka I/O payekha, ma frequency a 400 kHz, ndi ma CD ang'onoang'ono.Zowonjezera za I / O zimapereka yankho losavuta pamene I / O yowonjezera ikufunika pa ACPI zosinthira mphamvu, masensa, mabatani okankhira, ma LED, mafani, ndi zina zotero.PCA9554/PCA9554A imakhala ndi regista ya 8-bit Configuration (Kusankha Zolowetsa kapena Zotulutsa);Regista ya 8-bit Input Port, regista ya 8-bit Output Port ndi regista ya 8-bit Polarity Inversion (yogwira YAM'MBUYO kapena yogwira ntchito LOW).Katswiri wamakina amatha kupangitsa ma I/O kukhala ngati zolowetsa kapena zotuluka polemba ku ma I/O configuration bits.Zomwe zalowetsedwa kapena zotulutsa zilizonse zimasungidwa muzolembera zofananira za Input Port kapena Output Port.Polarity ya registry yowerengedwa ikhoza kusinthidwa ndi regista ya Polarity Inversion.Ma registry onse amatha kuwerengedwa ndi master system.Ngakhale adilesi ya pin-to-pin ndi I2C-bus ikugwirizana ndi mndandanda wa PCF8574, kusintha kwa mapulogalamu kumafunika chifukwa cha zowonjezera ndipo zimakambidwa mu Application Note AN469.Kutulutsa kosokoneza kwa PCA9554/PCA9554A kumayatsidwa pomwe malo aliwonse olowetsa asiyana ndi momwe amalembera a Input Port ndipo amagwiritsidwa ntchito kusonyeza kwa mbuye wa dongosolo kuti malo olowera asintha.Kukhazikitsanso mphamvu kumakhazikitsa zolembetsa kuzinthu zawo zokhazikika ndikuyambitsa makina amtundu wa chipangizocho.Mapini atatu a hardware (A0, A1, A2) amasinthasintha ma adilesi okhazikika a I2C-basi ndikulola zida zopitilira zisanu ndi zitatu kugawana I2C-bus/SMBus yomweyo.PCA9554A ndi yofanana ndi PCA9554 kupatula kuti adilesi yokhazikika ya I2C-basi ndiyosiyana kulola mpaka khumi ndi zisanu ndi chimodzi mwa zida izi (zitatu zilizonse) pa I2C-bus/SMBus yomweyo.