Hi Sir
We used LMX2491 for design and it cannot output well
a. I created register values by TICS pro and send them via SPI interface. But when I measured the CPout, it showed about 400mV.
b. I measured the SPI signal from MCU. and the signal is ok
c. I also check the register of R2 bit[1:0]
d.below is the SPI command we sent
const uint8_t aTxBuffer[] = {
0x00, /*write*/
0x8D, /*Addr*/
0x00, //R141
0x0A, //R140
0x28, //R139
0x00, //R138
0x00, //R137
0x00, //R136
0x00, //R135
0x00, //R134
0x0A, //R133
0x28, //R132
0x00, //R131
0x00, //R130
0x00, //R129
0x00, //R128
0x00, //R127
0x0A, //R126
0x28, //R125
0x00, //R124
0x00, //R123
0x00, //R122
0x00, //R121
0x00, //R120
0x0A, //R119
0x28, //R118
0x00, //R117
0x00, //R116
0x00, //R115
0x00, //R114
0x00, //R113
0x0A, //R112
0x28, //R111
0x00, //R110
0x00, //R109
0x00, //R108
0x00, //R107
0x00, //R106
0x0A, //R105
0x28, //R104
0x00, //R103
0x00, //R102
0x00, //R101
0x00, //R100
0x00, //R99
0x0A, //R98
0x28, //R97
0x00, //R96
0x00, //R95
0x00, //R94
0x00, //R93
0x00, //R92
0x05, //R91
0x14, //R90
0x3F, //R89
0xFF, //R88
0xFA, //R87
0x2F, //R86
0x00, //R85
0x00, //R84
0x00, //R83
0x02, //R82
0x9D, //R81
0x8A, //R80
0xDA, //R79
0xFE, //R78
0xC4, //R77
0xEA, //R76
0x4B, //R75
0x00, //R74
0x00, //R73
0x00, //R72
0x00, //R71
0x08, //R70
0x00, //R69
0x00, //R68
0xCE, //R67
0xC5, //R66
0x6D, //R65
0x00, //R64
0x00, //R63
0xCE, //R62
0xC5, //R61
0x6D, //R60
0x00, //R59
0x00, //R58
0x00, //R57
0x00, //R45
0x00, //R44
0x00, //R43
0x00, //R42
0x00, //R41
0x00, //R40
0x52, //R39
0x18, //R38
0x10, //R37
0x08, //R36
0x41, //R35
0x04, //R34
0x20, //R33
0x00, //R32
0x32, //R31
0x0A, //R30
0x00, //R29
0x1F, //R28
0x08, //R27
0x00, //R26
0x01, //R25
0x00, //R24
0x03, //R23
0xE8, //R22
0x00, //R21
0x03, //R20
0x28, //R19
0x2C, //R18
0x00, //R17
0x39, //R16
0x00, //R15
0x00, //R14
0x00, //R13
0x00, //R12
0x00, //R11
0x00, //R10
0x00, //R9
0x00, //R8
0x00, //R7
0x00, //R6
0x00, //R5
0x00, //R4
0x00, //R3
0x01, //R2
0x00, //R1
0x18 //R0
};
please advise what we need to check
BR
Yiimin
