• LTC2945 Start-up

    Hello, I have a question about the LTC2945.
    My customer is considering the LTC2945.
    I received a question from a customer.

    How many mS after power-up is desired when the microcontroller accesses the LTC2945 via I2C?
    Or should the microcontroller retry until…

  • LTC2945 communication problem

    Hi,

    My schematic is simple as shown in datasheet:

    The ADIN is grounded as not used. 

    ADR1 and ADR0 are connected to ground. So, device address should be 0xDE.

    However I dont get any ACK when shifting address as below:

    Any idea would be welcomed…

  • LTC2946/LTC2945

    My application is to use the LTC 2946 in a serial connected string of batteries to measure total string current and voltage appliyng it in two distinct design:
    One for -48V as commoly used in telecom industry, and another one to be used to read from +4…

  • LTC2945 RSHNT formula:

    Hi sir 

    For the bottom RSHNT formula, my customer replies to me and needs to know the RSHNT calculation method and application value.

    (1)  Vs_max and VS_Min  , How Vs_max and VS_Min choose this value

    (2)  -5.9 and -6.7 are fixed values that cannot be changed…

  • 关于LTC2945的问题

    最近研究LTC2945,搭建了简易的测试电路,测试结果很怪异。

    Vad 计算后显示 0.5mV/LSB
    表 mV   mA CODE
    0 8 00FF
    8 16 01FF
    18.7 32 03FF
  • LTC2945 communicate problem in reading

    Hi,
    My schematic is simple as shown in datasheet, the VDD and INTVCC is powered by 3.3V.

    The master communicated with the slave by using the common Mass Writeaddress (1100 110b).
    When I read the REGISTER ADDRESS(02h) as figure 10, after the S(start), the…

  • 关于LTC2945的问题

    我们最近在用LTC2945监测设备输出的电压和电流,但是使用过程中会出现INTVCC引脚对地击穿的现象,或者SDAO对地阻抗变低,导致I2C总线SDA持续拉低,整条总线都不能用的现象。

    LTC2945的供电是用稳压模块输出的+26V供电,INTVCC只是为后面的光耦供电,请教一下,什么情况下INTVCC或者SDAO才会对地击穿。

    电路是用的手册里推荐的电路,VDD供电是用的+26V,SDAI和SCL的上拉也是用的26V,而且是稳压模块输出的,INTVCC的电压波形也抓过,没用任何的过冲电压,为什么INTVCC会击穿…

  • ltc2945-1无法通讯

    你好

    请问下ltc2945-1无法通讯是什么原因,我使用intvcc接入单片机3v3电源,i2c使用单片机3v3上拉,但是收不到ack!

    sdai与sdao并联后,sdai会被拉低无法发送!

  • LTC2945 EVB issue with software QuikEval

    Hello,

    I tested the LTC2945 EVB ( DC1697A ) with the controller board ( DC590B ). I  executed the software QuikEval ( Version K114) after plungging the DC590B into PC( Windows 7 system ). I apply the "Run" button and the error message is occured as below…

  • LTC2945 supply setup for negative voltages

    I have several negative supply voltages I need to monitor (-2V, -5V, and -30V).

    Looking at the block diagram (p. 9)... if I'm connecting the negative supply to the GND pin, am I correct in assuming I'll need optical isolators for I2C in all cases since…