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TH3122KDF Datasheet(PDF) 5 Page - Melexis Microelectronic Systems |
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TH3122KDF Datasheet(HTML) 5 Page - Melexis Microelectronic Systems |
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5 / 14 page  TH3122 K-Bus Transceiver with integrated Voltage Regulator Dec/04 Page 5 3901003122 Rev 004 Figure 7 - Initialization The input EN has an internal pull down resistor. If EN=high, the internal pull down current is switched off to minimize the quiescent current. RESET Output The RESET output is switched from low to high if VS is switched on and VCC>VRESEIN after the time tRES. If the voltage VCC drops below VRES1 or VRES2 then the RESET output is switched from high to low after the time trr has been reached. The voltage level for VRES1 and VRES2 and the corresponding times tRES can be programmed via the analogue input VTR. Wake up with BUS traffic If the regulator is put in standby mode it can be woken up with the BUS interface. Every pulse on the BUS (high pulse or low pulse) with a pulse width of min. 45 µ s will switch on the regulator. After the BUS has woken up the regulator, it can only be switched off with a high level followed by a low level on the EN pin. Reset Programming on VTR With the VTR pin the reset switches off levels and delay time can be programmed. The voltage on VCC influences the reset function. VTR-Programming The voltage on VTR input is read out if the voltage at this pin is higher than VRESEIN . This value defines the reset switch off voltage VRES. With the next oscillator cycle it switches on the pull up current source if VTR=low or the pull down current source if VTR=high. The sources are active for one oscillator cycle. The level changes during this procedure on VTR, which depends on the external pull up or pull down resistors control the reset time tRes Temperature Limitation If the junction temperature 150ºC < Tj < 170ºC the over temperature recognition will be active and the regulator voltage and the BUS driver will be switched off. After Tj falls below 140ºC the TH3122 will be initialized, independently of the voltage levels on EN and BUS. The function of the TH3122 is possible between TAmax and the switch off temperature, but small parameter differences can appear. Low Voltage Detection VS Low voltage on VS is monitored on SENSE output. If VS has reached the level of VS =6.8V then the SENSE output generates low level. The normal operating range is VS > 7.8V and the SENSE output generates a high level. Universal Comparator The TH3122 consist of a universal comparator for general use. The positive input of this comparator is connected to the pin SI. The input voltage range of SI is 0V...VS. The input voltage is compared with a fixed reference voltage at high or low level and the comparator output SO drives a 5V digital signal. VS VCC t Res V RESEIN t rr V RES1/2 RESET VTR-Mode VRES tRes VTR = GND VRES = VRES1 = 3.15V 100ms VTR = VCC VRES = VRES2 = 4.65V 100ms VTR with R ≥ 50k Ω to GND VRES = VRES1 = 3.15V 15ms VTR with R ≥ 50k Ω to VCC VRES = VRES2 = 4.65V 15ms |
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Similar Description - TH3122KDF |
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