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SMM150ER00 Datasheet(PDF) 11 Page - Summit Microelectronics, Inc. |
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SMM150ER00 Datasheet(HTML) 11 Page - Summit Microelectronics, Inc. |
11 / 22 page SMM150 Preliminary Information Summit Microelectronics, Inc 2075 2.6 05/13/05 11 Fault Latched by a Fault Condition: The “Fault Latched by a Fault Condition” programmable option is triggered only on the leading edge of a Fault. That is, a latched fault can be cleared while the Fault yet exists. Fault Latched by Ready I/O Pin: Fault Latched by Ready I/O pin functions on the margin transitions from Off to Hi/Low/Nominal or from Nominal to Hi/Low or Hi/Low to Nominal but not from Hi/Low/Nominal to Off. WRITE PROTECTION Write protection for the SMM150 is located in a volatile register where the power-on state is defaulted to write protect. There are separate write protect modes for the configuration registers and memory. In order to remove write protection, the code 55HEX is written to the write protection register. Other codes will enable write protection. For example, writing 59HEX will allow writes to the configuration register but not to the memory, while writing 35HEX will allow writes to the memory but not to the configuration registers. The SMM150 also features a Write Protect pin (WP input) which, when asserted, prevents writing to the configuration registers and EE memory. In addition to these two forms of write protection there is a configuration register lock bit which, once programmed, does not allow the configuration registers to be changed. A2, A1, A0 The address bits A[2:0] can be hard wired High or Low or may be left open (High-Z) to allow for a total of 21 distinct device addresses. When floating, the inputs can tolerate the amount of leakage as described by the specification IAIT. An external 100k pull-up or pull down resistor is sufficient to set a High or Low logic level. U2 DC-DC Converter 1 2 3 4 7 8 9 10 11 +Vout +Vout Sense +Vout +Vin +Vin +Vin Trim Enable C10 0.1uF READY C7 0.01uF R8 Vdd R6 FAULT# J2 Programming Supply 1 2 1 2 VOUT = 1.5V U3 SMM150 1 2 4 6 7 8 10 12 14 19 20 24 25 28 SCL A2 A1 A0 GND WP CAP_M COMP2 VM COMP1 TRIM MUP MDN SDA C4 0.02uF C3 10uF C6 0.01uF D1 DIODE MDN J1 I2C SMX3200 Connector 1 2 3 4 5 6 7 8 9 10 Gnd SCL Gnd3 SDA Rsrv5 MR +10V Rsrv8 +5V Rsrv10 C8 0.1uF Vdd R7 C1 0.01uF R3 20 C2 0.1uF MUP C5 1uF R4 2.5k C9 0.01uF R5 +VIN - 2.7V to 5.5V Figure 6 – Typical applications schematic which shows the SMM150 controlling a 3.3V in/1.5V out DC/DC converter. Care should be taken to filter DC/DC converter noise from the SMM150 VDD supply pin. This is accomplished with optional components R3, C1, C2, C3 and C10. This example, using a 1.25V VREF, also shows the COMP1/2 pins monitoring the DC/DC converter VOUT set to an OV of 1.7V on COMP1 and a UV of 1.3V on COMP2, the voltage divider resistors are: For OV, R5 = 1.37k, 1% R6 = 3.83k, 1%, For UV, R7= 1.02k, 1% R8 = 25.5k, 1%. The jumper J2 can be used to supply the SMM150 VDD voltage from the SMX3200 programmer when the device is programmed with board power off and the controlled supply unloaded. APPLICATIONS INFORMATION (CONTINUED) |
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