TDC7200: a lot of change in TIME2, TIME3 , ...!

hamid lotfalizadeh

Part Number: TDC7200
Other Parts Discussed in Thread: TDC1000

Hello,

i have problem with TDC1000 and TDC7200 for calculate flow!

after a lot of test i found the problem but i couldn't solve it!

my problem is flow have a lot of change! i check all parameters have effect in flow equation, almost all of them are fix in stable flow except one of them! the variable parameter is TIME2!

i checked TIMEs (TIME3,4 and 5) all of them have a lot of change!
you can see in attached file result of one test with this situation:

uint8_t TDC7200_reg_local_copy[10] = {0x02, /*0x58*/0x5C, 0x1F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0x0, 0x0 };
uint8_t TDC1000_reg_local_copy[10] = {0x4F, /*0x59*/0x5D, 0x32, 0x42, 0x1F, 0x80, 0x1F, 0x03, 0x02, 0x00};

10-1-1-RUN-35mv -UP- STOP3-G12 - Result.xlsx

Clock Count	TIME1	TIME4	CALIB1	normLSB
702	2152	2131	2322	0.053879
702	2152	2096	2321	0.053892
702	2152	2116	2322	0.053892
702	2152	2069	2322	0.053887
702	2151	1968	2321	0.0539
702	2152	1889	2321	0.0539
702	2152	1903	2321	0.0539
702	2151	1910	2321	0.053897
702	2151	1849	2321	0.0539
702	2151	1882	2321	0.053903
702	2151	1910	2321	0.053897
702	2152	1874	2321	0.053897
702	2151	1888	2321	0.053905
702	2151	1875	2321	0.0539
702	2151	1873	2321	0.05391
702	2151	1862	2321	0.053908
702	2151	1855	2320	0.053915
702	2151	1857	2321	0.053895
702	2151	1880	2321	0.05391
702	2151	1901	2321	0.05391
702	2152	1891	2321	0.053897
702	2151	1902	2321	0.053903
702	2152	1899	2321	0.053895
702	2151	1878	2320	0.053903
702	2152	1881	2322	0.053887
702	2151	1880	2320	0.053915
702	2151	1875	2320	0.053913
702	2151	1905	2321	0.05391
702	2151	1901	2321	0.0539
702	2151	1885	2321	0.053908
702	2151	1879	2321	0.05391
702	2151	1882	2321	0.0539
702	2151	1897	2320	0.05391
702	2151	1917	2320	0.053913
702	2152	1918	2321	0.053892