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tusb4041i PWRCTL2/BATEN2使能问题

ce guo
Intellectual 576 points


第一次使用这个片子，是使用smbus进行配置，

通过命令i2cdetect -r -0 可以检测到设备，

然后想要使能PWRCTL2/BATEN2引脚，以打开下游的电源开关，

但是执行命令：

root@am57xx-evm:~# i2cset -y 0 0x46 0x06 0x0f
root@am57xx-evm:~# i2cdump -y 0 0x46
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 00 51 04 40 81 18 0f 0f 0f 00 30 00 00 00 00 00 .Q?@?????.0.....
10: 02 40 1c 0e 8a c5 c1 ce 30 16 a6 12 27 2d 03 00 ?@??????0???'-?.
20: 09 04 18 00 00 00 00 00 00 00 00 00 00 00 00 00 ???.............
30: 37 00 33 00 30 00 38 00 30 00 38 00 34 00 39 00 7.3.0.8.0.8.4.9.
40: 46 00 32 00 31 00 46 00 00 00 00 00 00 00 00 00 F.2.1.F.........
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
d0: 1e 1e 1e 1e 1e 00 00 00 18 18 18 18 18 00 00 00 ?????...?????...
e0: 04 04 04 04 04 00 00 00 77 77 77 77 77 00 00 00 ?????...wwwww...
f0: 00 00 00 00 81 81 81 81 01 12 00 00 00 00 00 00 ....??????......

之后可以看到0x06寄存器的值已经改变为0x0f了，使能了这个引脚，可是去测量电压，发现这个引脚的电压没有变化

请问要如何使能这个引脚呢？

  • 0
    TI__Guru**** 295050 points

    是要启用battery charge功能是吗？那么这个引脚需要上拉4.7Kohm到Vcc。

    这个引脚即为输入也是输出引脚，上电时，这个引脚是输出，disable/enable power switch, 输出高或低电平取决于 PWRCTL_POL的引脚配置。

  • 0 回复 Kailyn Chen
    Intellectual 576 points

    不需要启用battery charge功能，所以这个引脚我们没有添加上拉电阻。

    这里已经将PWRCTL_POL引脚拉高了，0x0a寄存器的值为0x30，这就已经是将这个引脚拉高了，而且这个引脚是直接连接上拉电阻的，量取的值也是3.3V,

    可是上电默认0x06的值为0，也就是PWRCTL2/BATEN2引脚为0，修改0x06位0x0f，量取PWRCTL2/BATEN2引脚的值仍然为0

    请问如果使PWRCTL2/BATEN2引脚输出高电平呢

  • 0 回复 Kailyn Chen
    Intellectual 576 points

    你好，我将R392卸掉，在R393的位置添加了一个4.7K的上拉电阻，

    root@am57xx-evm:~# i2cdump -y 0 0x46
    No size specified (using byte-data access)
    0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
    00: 00 51 04 40 81 18 04 0f 0f 00 30 00 00 00 00 00 .Q?@?????.0.....
    10: 02 40 1c 0e 8a c5 c1 ce 30 16 a6 12 27 2d 03 00 ?@??????0???'-?.
    20: 09 04 18 00 00 00 00 00 00 00 00 00 00 00 00 00 ???.............
    30: 37 00 33 00 30 00 38 00 30 00 38 00 34 00 39 00 7.3.0.8.0.8.4.9.
    40: 46 00 32 00 31 00 46 00 00 00 00 00 00 00 00 00 F.2.1.F.........
    50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    d0: 1e 1e 1e 1e 1e 00 00 00 18 18 18 18 18 00 00 00 ?????...?????...
    e0: 04 04 04 04 04 00 00 00 77 77 77 77 77 00 00 00 ?????...wwwww...
    f0: 00 00 00 00 80 80 a0 80 01 12 00 00 00 00 00 00 ....??????......

    显示0x06寄存器的值为0x04，也就是PWRCTL3/BATEN3是被使能的，可是量取该引脚的值，还是低电平

  • 0 回复 ce guo
    TI__Guru**** 295050 points

    不使用battery charge功能的话，直接悬空PWRCTL_POL 使得PWRCTTx enable，因为内部已经上拉，所以输出应该为high。

    The PWRCTL_POL is left unconnected which results in active-high power enable (PWRCTL1, PWRCTL2, PWRCTL3, and PWRCTL4) for a USB VBUS power switch.

  • 0 回复 Kailyn Chen
    Intellectual 576 points

    感谢回复，

    我有尝试将PWRCTL_POL引脚悬空，但是还是没有效果啊，PWRCTL1, PWRCTL2, PWRCTL3, PWRCTL4几个引脚的值仍然是低电平，

    如我之前所说的，我也尝试在PWRCTL3引脚添加上拉电阻，但是只要取消复位，tusb4041就会将该引脚拉低，这时通过i2c总线读取0x06寄存器，值为0x04，说明PWRCTL3引脚是高电平，但该引脚的实际电压值为0V

    直接通过smbus对寄存器进行写入数值，对应引脚不守影响吗？

    目前的情况是引脚只输出的低电平，写寄存器内部的值对引脚没有作用，

  • 0 回复 ce guo
    Prodigy 130 points

    您好，想请教你一下，您所使用的读写寄存器的软件是哪款呀，是用smbus协议通过usb上端口进行配置么

  • 0 回复 Zhenting Liu
    Intellectual 576 points
    你好，
    这款芯片使用i2c对内部寄存器读写，所以使用的是内嵌的i2c命令进行调试的