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TC1307 Datasheet(PDF) 11 Page - Microchip Technology |
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TC1307 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 28 page 2002 Microchip Technology Inc. DS21702A-page 11 TC1307 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin Description Table. 3.1 Voltage Detect Input (VDET) Input pin that is compared to internal threshold voltage (typically 2.63V). When the VDET input is below the 2.63V threshold, the RESET output is held in its normal low state. When the input voltage on the VDET pin rises above the threshold voltage, the RESET output pin remains low for 300 mS (Typical). After the delay, the RESET pin changes to a logic high state. 3.2 Shutdown Control Input for VOUT1 (SHDN1) LDO#1 output is enabled when a logic high is applied to the SHDN1 input. LDO#1 output is disabled with a logic low tied to the SHDN1 pin. When shutdown, LDO#1 enters a low quiescent current state and the lin- ear pass P-Channel MOSFET is off. The RESET out- put remains valid and is independent of SHDN1. 3.3 SELECT Control Input for Setting VOUT1 and VOUT2 (SELECT12) Input pin used to select the output voltage of LDO#1 and LDO#2. When SELECT is tied to VIN, VOUT1 = VOUT2 = 3.0V. When SELECT is tied to GND, VOUT1 = VOUT2 = 2.5V. If the SELECT input is not connected, VOUT1 = VOUT2 = 2.8V. 3.4 Input Voltage VIN Connect input source to this pin. All VIN pins must be tied together. 3.5 Ground (GND) Connect this pin to the circuit ground. NOTE: This pin does not carry high current and should be connected to quiet circuit ground. 3.6 Shutdown Control Input for VOUT3 (SHDN3) LDO#3 output is enabled when a logic high is applied to the SHDN3 input. LDO#3 output is disabled with a logic low tied to the SHDN3 pin. When shutdown, LDO#3 enters a low quiescent current state and the lin- ear pass P-Channel MOSFET is off. The RESET out- put remains valid and is independent of SHDN3. 3.7 Shutdown Control Input for VOUT4 (SHDN4) LDO#4 output is enabled when a logic high is applied to the SHDN4 input. LDO#4 output is disabled with a logic low tied to the SHDN4 pin. When shutdown, LDO#4 enters a low quiescent current state and the lin- ear pass P-Channel MOSFET is off. The RESET out- put remains valid and is independent of SHDN4. 3.8 SELECT Control Input for Setting VOUT3 and VOUT4 (SELECT34) Input pin used to select the output voltage of LDO#3 and LDO#4. When SELECT is tied to VIN, VOUT3 = VOUT4 = 2.8V. When SELECT is tied to GND, VOUT3 = VOUT4 = 1.8V. If the SELECT input is not connected, VOUT3 = VOUT4 = 2.5V. 3.9 Regulated Output Voltage #4 (VOUT4) Output voltage selected by tri-state input SELECT34. Output can be set to 1.80V, 2.50V or 2.80V 3.10 Regulated Output Voltage #3 (VOUT3) Output voltage selected by tri-state input SELECT34. Output can be set to 1.80V, 2.50V or 2.80V 3.11 Regulated Output Voltage #2 (VOUT2) Output voltage selected by tri-state input SELECT12. Output can be set to 2.50V, 2.80V or 3.00V 3.12 Regulated Output Voltage #1 (VOUT1) Output voltage selected by tri-state input SELECT12. Output can be set to 2.50V, 2.80V or 3.00V. Name Function VDET Voltage Detect Input SHDN1 Shutdown for VOUT1 SELECT12 Input for setting VOUT1 and VOUT2. VIN Input Voltage Connection VIN Input Voltage Connection GND Ground connection SHDN3 Shutdown for VOUT3 VIN Input Voltage Connection SHDN4 Shutdown for VOUT4 SELECT34 Input for setting VOUT3 and VOUT4. VOUT4 LDO4 Output VOUT3 LDO3 Output VOUT2 LDO2 Output VOUT1 LDO1 Output SHDN2 Shutdown for VOUT2 RESET Reset Output |
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